diff --git a/Cargo.lock b/Cargo.lock
index 12d98bff..9b25678f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1034,12 +1034,12 @@ dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lz4 1.23.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rbx_dom_weak 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rbx_dom_weak 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rbx_dom_weak"
-version = "1.2.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1055,7 +1055,7 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rbx_dom_weak 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rbx_dom_weak 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1068,7 +1068,7 @@ dependencies = [
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "maplit 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rbx_dom_weak 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rbx_dom_weak 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "xml-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1200,7 +1200,7 @@ dependencies = [
  "paste 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_assertions 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rbx_binary 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rbx_dom_weak 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rbx_dom_weak 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rbx_reflection 2.0.374 (registry+https://github.com/rust-lang/crates.io-index)",
  "rbx_xml 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1874,7 +1874,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "abf9b09b01790cfe0364f52bf32995ea3c39f4d2dd011eac241d2914146d0b44"
 "checksum rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cbf7e9e623549b0e21f6e97cf8ecf247c1a8fd2e8a992ae265314300b2455d5c"
 "checksum rbx_binary 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b147f236284747ac1b4643476265dd36b402877d97adb7cbd0fafc1d247de0a5"
-"checksum rbx_dom_weak 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e31ec3223caeb1a57254a8a10b33614a2d457517be01ef93694f83d995833b04"
+"checksum rbx_dom_weak 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f2a2ba185abc08fa3fce3de6dc5446ccf82b759583aee20fc07fced859dcc31f"
 "checksum rbx_reflection 2.0.374 (registry+https://github.com/rust-lang/crates.io-index)" = "8a826ff869b33b54db727f9776f1dc7a8a779791f5a46ddd4941b8334bf909fe"
 "checksum rbx_xml 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a240c155684b744c4985f283702b61f6ab0a2d4479694051d875844632c9f454"
 "checksum rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
diff --git a/server/Cargo.toml b/server/Cargo.toml
index e005a52d..d7732f3d 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -30,7 +30,7 @@ log = "0.4"
 maplit = "1.0.1"
 notify = "4.0"
 rbx_binary = "0.4.0"
-rbx_dom_weak = "1.2.0"
+rbx_dom_weak = "1.3.0"
 rbx_xml = "0.5.0"
 rbx_reflection = "2.0.374"
 regex = "1.0"
diff --git a/server/src/snapshot_reconciler.rs b/server/src/snapshot_reconciler.rs
index 2b52ca52..baaa3309 100644
--- a/server/src/snapshot_reconciler.rs
+++ b/server/src/snapshot_reconciler.rs
@@ -153,7 +153,7 @@ pub fn reify_subtree(
     instance_per_path: &mut PathMap<HashSet<RbxId>>,
     metadata_per_instance: &mut HashMap<RbxId, MetadataPerInstance>,
     changes: &mut InstanceChanges,
-) {
+) -> RbxId {
     let instance = reify_core(snapshot);
     let id = tree.insert_instance(instance, parent_id);
 
@@ -164,6 +164,8 @@ pub fn reify_subtree(
     for child in &snapshot.children {
         reify_subtree(child, tree, id, instance_per_path, metadata_per_instance, changes);
     }
+
+    id
 }
 
 fn reify_metadata(
@@ -222,6 +224,9 @@ fn reify_core(snapshot: &RbxSnapshotInstance) -> RbxInstanceProperties {
     instance
 }
 
+/// Updates the given instance to match the properties defined on the snapshot.
+///
+/// Returns whether any changes were applied.
 fn reconcile_instance_properties(instance: &mut RbxInstanceProperties, snapshot: &RbxSnapshotInstance) -> bool {
     let mut has_diffs = false;
 
@@ -279,6 +284,8 @@ fn reconcile_instance_properties(instance: &mut RbxInstanceProperties, snapshot:
     has_diffs
 }
 
+/// Updates the children of the instance in the `RbxTree` to match the children
+/// of the `RbxSnapshotInstance`. Order will be updated to match.
 fn reconcile_instance_children(
     tree: &mut RbxTree,
     id: RbxId,
@@ -287,12 +294,21 @@ fn reconcile_instance_children(
     metadata_per_instance: &mut HashMap<RbxId, MetadataPerInstance>,
     changes: &mut InstanceChanges,
 ) {
-    let mut visited_snapshot_indices = HashSet::new();
-
-    let mut children_to_update: Vec<(RbxId, &RbxSnapshotInstance)> = Vec::new();
-    let mut children_to_add: Vec<&RbxSnapshotInstance> = Vec::new();
+    // These lists are kept so that we can apply all the changes we figure out
+    let mut children_to_maybe_update: Vec<(RbxId, &RbxSnapshotInstance)> = Vec::new();
+    let mut children_to_add: Vec<(usize, &RbxSnapshotInstance)> = Vec::new();
     let mut children_to_remove: Vec<RbxId> = Vec::new();
 
+    // This map is used once we're done mutating children to sort them according
+    // to the order specified in the snapshot. Without it, a snapshot with a new
+    // child prepended will cause the RbxTree instance to have out-of-order
+    // children and would make Rojo non-deterministic.
+    let mut ids_to_snapshot_indices = HashMap::new();
+
+    // Since we have to enumerate the children of both the RbxTree instance and
+    // our snapshot, we keep a set of the snapshot children we've seen.
+    let mut visited_snapshot_indices = vec![false; snapshot.children.len()];
+
     let children_ids = tree.get_instance(id).unwrap().get_children_ids();
 
     // Find all instances that were removed or updated, which we derive by
@@ -303,7 +319,7 @@ fn reconcile_instance_children(
         // Locate a matching snapshot for this instance
         let mut matching_snapshot = None;
         for (snapshot_index, child_snapshot) in snapshot.children.iter().enumerate() {
-            if visited_snapshot_indices.contains(&snapshot_index) {
+            if visited_snapshot_indices[snapshot_index] {
                 continue;
             }
 
@@ -311,7 +327,8 @@ fn reconcile_instance_children(
             // similar. This heuristic is similar to React's reconciliation
             // strategy.
             if child_snapshot.name == child_instance.name {
-                visited_snapshot_indices.insert(snapshot_index);
+                ids_to_snapshot_indices.insert(child_id, snapshot_index);
+                visited_snapshot_indices[snapshot_index] = true;
                 matching_snapshot = Some(child_snapshot);
                 break;
             }
@@ -319,26 +336,23 @@ fn reconcile_instance_children(
 
         match matching_snapshot {
             Some(child_snapshot) => {
-                children_to_update.push((child_instance.get_id(), child_snapshot));
-            },
+                children_to_maybe_update.push((child_instance.get_id(), child_snapshot));
+            }
             None => {
                 children_to_remove.push(child_instance.get_id());
-            },
+            }
         }
     }
 
     // Find all instancs that were added, which is just the snapshots we didn't
     // match up to existing instances above.
     for (snapshot_index, child_snapshot) in snapshot.children.iter().enumerate() {
-        if !visited_snapshot_indices.contains(&snapshot_index) {
-            children_to_add.push(child_snapshot);
+        if !visited_snapshot_indices[snapshot_index] {
+            children_to_add.push((snapshot_index, child_snapshot));
         }
     }
 
-    for child_snapshot in &children_to_add {
-        reify_subtree(child_snapshot, tree, id, instance_per_path, metadata_per_instance, changes);
-    }
-
+    // Apply all of our removals we gathered from our diff
     for child_id in &children_to_remove {
         if let Some(subtree) = tree.remove_instance(*child_id) {
             for id in subtree.iter_all_ids() {
@@ -348,7 +362,18 @@ fn reconcile_instance_children(
         }
     }
 
-    for (child_id, child_snapshot) in &children_to_update {
+    // Apply all of our children additions
+    for (snapshot_index, child_snapshot) in &children_to_add {
+        let id = reify_subtree(child_snapshot, tree, id, instance_per_path, metadata_per_instance, changes);
+        ids_to_snapshot_indices.insert(id, *snapshot_index);
+    }
+
+    // Apply any updates that might have updates
+    for (child_id, child_snapshot) in &children_to_maybe_update {
         reconcile_subtree(tree, *child_id, child_snapshot, instance_per_path, metadata_per_instance, changes);
     }
+
+    // Apply the sort mapping defined by ids_to_snapshot_indices above
+    let instance = tree.get_instance_mut(id).unwrap();
+    instance.sort_children_unstable_by_key(|id| ids_to_snapshot_indices.get(&id).unwrap());
 }
\ No newline at end of file
diff --git a/server/tests/snapshot_reconciler.rs b/server/tests/snapshot_reconciler.rs
index 4888e917..34dec829 100644
--- a/server/tests/snapshot_reconciler.rs
+++ b/server/tests/snapshot_reconciler.rs
@@ -11,10 +11,7 @@ use librojo::{
 
 use test_util::tree::trees_equal;
 
-// TODO: Snapshot application isn't communicative right now with the current
-// snapshot reconciler. In practice this mostly isn't a problem, but presents
-// a problem trying to rely on determinism to make snapshot tests.
-// #[test]
+#[test]
 fn patch_communicativity() {
     let base_tree = RbxTree::new(RbxInstanceProperties {
         name: "DataModel".into(),
diff --git a/test-projects/multi_partition_game/initial.tree.json b/test-projects/multi_partition_game/initial.tree.json
index b6a2208c..9b5d5f08 100644
--- a/test-projects/multi_partition_game/initial.tree.json
+++ b/test-projects/multi_partition_game/initial.tree.json
@@ -1,6 +1,6 @@
 {
   "instances": {
-    "8d44bb30-db3c-4366-a6c5-633bd1441885": {
+    "00f207b1-fc18-4088-a45e-caf8cd98f5dd": {
       "Name": "main",
       "ClassName": "ModuleScript",
       "Properties": {
@@ -9,69 +9,32 @@
           "Value": "-- hello, from a/main.lua"
         }
       },
-      "Id": "8d44bb30-db3c-4366-a6c5-633bd1441885",
+      "Id": "00f207b1-fc18-4088-a45e-caf8cd98f5dd",
       "Children": [],
-      "Parent": "1aafa29b-bdca-40a0-a677-7ead327b84ce"
+      "Parent": "14fed1a3-ba97-46a6-ae93-ac26bd9471df"
     },
-    "b1c9928c-bf11-427f-90eb-b672c811d859": {
+    "14fed1a3-ba97-46a6-ae93-ac26bd9471df": {
+      "Name": "Ack",
+      "ClassName": "Folder",
+      "Properties": {},
+      "Id": "14fed1a3-ba97-46a6-ae93-ac26bd9471df",
+      "Children": [
+        "c55fd55c-258e-4a93-a63a-ea243038c9b9",
+        "00f207b1-fc18-4088-a45e-caf8cd98f5dd"
+      ],
+      "Parent": "99eefe5f-ef74-49e6-8a8b-c833e00ca56b"
+    },
+    "c910510c-37a8-4fd8-ae41-01169ccb739c": {
       "Name": "Bar",
       "ClassName": "Folder",
       "Properties": {},
-      "Id": "b1c9928c-bf11-427f-90eb-b672c811d859",
+      "Id": "c910510c-37a8-4fd8-ae41-01169ccb739c",
       "Children": [
-        "8d690a2a-e987-4c86-b9ac-18e6d3a98503"
+        "71a95983-c856-4cf2-aee6-bd8a523e80e4"
       ],
-      "Parent": "9f141826-14c2-492b-b360-2558712f0c08"
+      "Parent": "99eefe5f-ef74-49e6-8a8b-c833e00ca56b"
     },
-    "645ba594-4482-441f-9f41-5bb9c444405b": {
-      "Name": "multi_partition_game",
-      "ClassName": "DataModel",
-      "Properties": {},
-      "Id": "645ba594-4482-441f-9f41-5bb9c444405b",
-      "Children": [
-        "b1298bcc-e370-44a6-9ef4-fbefa290124c",
-        "9f141826-14c2-492b-b360-2558712f0c08"
-      ],
-      "Parent": null
-    },
-    "9f141826-14c2-492b-b360-2558712f0c08": {
-      "Name": "ReplicatedStorage",
-      "ClassName": "ReplicatedStorage",
-      "Properties": {},
-      "Id": "9f141826-14c2-492b-b360-2558712f0c08",
-      "Children": [
-        "1aafa29b-bdca-40a0-a677-7ead327b84ce",
-        "b1c9928c-bf11-427f-90eb-b672c811d859"
-      ],
-      "Parent": "645ba594-4482-441f-9f41-5bb9c444405b"
-    },
-    "8d690a2a-e987-4c86-b9ac-18e6d3a98503": {
-      "Name": "something",
-      "ClassName": "ModuleScript",
-      "Properties": {
-        "Source": {
-          "Type": "String",
-          "Value": "-- b/something.lua"
-        }
-      },
-      "Id": "8d690a2a-e987-4c86-b9ac-18e6d3a98503",
-      "Children": [],
-      "Parent": "b1c9928c-bf11-427f-90eb-b672c811d859"
-    },
-    "b1298bcc-e370-44a6-9ef4-fbefa290124c": {
-      "Name": "HttpService",
-      "ClassName": "HttpService",
-      "Properties": {
-        "HttpEnabled": {
-          "Type": "Bool",
-          "Value": true
-        }
-      },
-      "Id": "b1298bcc-e370-44a6-9ef4-fbefa290124c",
-      "Children": [],
-      "Parent": "645ba594-4482-441f-9f41-5bb9c444405b"
-    },
-    "54f2f276-964f-4c60-87d8-5fb2209c97c9": {
+    "c55fd55c-258e-4a93-a63a-ea243038c9b9": {
       "Name": "foo",
       "ClassName": "StringValue",
       "Properties": {
@@ -80,25 +43,153 @@
           "Value": "Hello world, from a/foo.txt"
         }
       },
-      "Id": "54f2f276-964f-4c60-87d8-5fb2209c97c9",
+      "Id": "c55fd55c-258e-4a93-a63a-ea243038c9b9",
       "Children": [],
-      "Parent": "1aafa29b-bdca-40a0-a677-7ead327b84ce"
+      "Parent": "14fed1a3-ba97-46a6-ae93-ac26bd9471df"
     },
-    "1aafa29b-bdca-40a0-a677-7ead327b84ce": {
-      "Name": "Ack",
-      "ClassName": "Folder",
+    "71a95983-c856-4cf2-aee6-bd8a523e80e4": {
+      "Name": "something",
+      "ClassName": "ModuleScript",
+      "Properties": {
+        "Source": {
+          "Type": "String",
+          "Value": "-- b/something.lua"
+        }
+      },
+      "Id": "71a95983-c856-4cf2-aee6-bd8a523e80e4",
+      "Children": [],
+      "Parent": "c910510c-37a8-4fd8-ae41-01169ccb739c"
+    },
+    "3b5af13f-c997-4009-915c-0810b0e83032": {
+      "Name": "multi_partition_game",
+      "ClassName": "DataModel",
       "Properties": {},
-      "Id": "1aafa29b-bdca-40a0-a677-7ead327b84ce",
+      "Id": "3b5af13f-c997-4009-915c-0810b0e83032",
       "Children": [
-        "54f2f276-964f-4c60-87d8-5fb2209c97c9",
-        "8d44bb30-db3c-4366-a6c5-633bd1441885"
+        "bf8e2d4f-33a0-42a0-8168-1b62d6ac050c",
+        "99eefe5f-ef74-49e6-8a8b-c833e00ca56b"
       ],
-      "Parent": "9f141826-14c2-492b-b360-2558712f0c08"
+      "Parent": null
+    },
+    "bf8e2d4f-33a0-42a0-8168-1b62d6ac050c": {
+      "Name": "HttpService",
+      "ClassName": "HttpService",
+      "Properties": {
+        "HttpEnabled": {
+          "Type": "Bool",
+          "Value": true
+        }
+      },
+      "Id": "bf8e2d4f-33a0-42a0-8168-1b62d6ac050c",
+      "Children": [],
+      "Parent": "3b5af13f-c997-4009-915c-0810b0e83032"
+    },
+    "99eefe5f-ef74-49e6-8a8b-c833e00ca56b": {
+      "Name": "ReplicatedStorage",
+      "ClassName": "ReplicatedStorage",
+      "Properties": {},
+      "Id": "99eefe5f-ef74-49e6-8a8b-c833e00ca56b",
+      "Children": [
+        "14fed1a3-ba97-46a6-ae93-ac26bd9471df",
+        "c910510c-37a8-4fd8-ae41-01169ccb739c"
+      ],
+      "Parent": "3b5af13f-c997-4009-915c-0810b0e83032"
     }
   },
-  "root_id": "645ba594-4482-441f-9f41-5bb9c444405b",
+  "root_id": "3b5af13f-c997-4009-915c-0810b0e83032",
   "metadata": {
-    "645ba594-4482-441f-9f41-5bb9c444405b": {
+    "00f207b1-fc18-4088-a45e-caf8cd98f5dd": {
+      "ignore_unknown_instances": false,
+      "source_path": "a/main.lua",
+      "project_definition": null
+    },
+    "bf8e2d4f-33a0-42a0-8168-1b62d6ac050c": {
+      "ignore_unknown_instances": true,
+      "source_path": null,
+      "project_definition": [
+        "HttpService",
+        {
+          "class_name": "HttpService",
+          "children": {},
+          "properties": {
+            "HttpEnabled": {
+              "Type": "Bool",
+              "Value": true
+            }
+          },
+          "ignore_unknown_instances": null,
+          "path": null
+        }
+      ]
+    },
+    "14fed1a3-ba97-46a6-ae93-ac26bd9471df": {
+      "ignore_unknown_instances": false,
+      "source_path": "a",
+      "project_definition": [
+        "Ack",
+        {
+          "class_name": null,
+          "children": {},
+          "properties": {},
+          "ignore_unknown_instances": null,
+          "path": "a"
+        }
+      ]
+    },
+    "c55fd55c-258e-4a93-a63a-ea243038c9b9": {
+      "ignore_unknown_instances": false,
+      "source_path": "a/foo.txt",
+      "project_definition": null
+    },
+    "71a95983-c856-4cf2-aee6-bd8a523e80e4": {
+      "ignore_unknown_instances": false,
+      "source_path": "b/something.lua",
+      "project_definition": null
+    },
+    "c910510c-37a8-4fd8-ae41-01169ccb739c": {
+      "ignore_unknown_instances": false,
+      "source_path": "b",
+      "project_definition": [
+        "Bar",
+        {
+          "class_name": null,
+          "children": {},
+          "properties": {},
+          "ignore_unknown_instances": null,
+          "path": "b"
+        }
+      ]
+    },
+    "99eefe5f-ef74-49e6-8a8b-c833e00ca56b": {
+      "ignore_unknown_instances": true,
+      "source_path": null,
+      "project_definition": [
+        "ReplicatedStorage",
+        {
+          "class_name": "ReplicatedStorage",
+          "children": {
+            "Ack": {
+              "class_name": null,
+              "children": {},
+              "properties": {},
+              "ignore_unknown_instances": null,
+              "path": "a"
+            },
+            "Bar": {
+              "class_name": null,
+              "children": {},
+              "properties": {},
+              "ignore_unknown_instances": null,
+              "path": "b"
+            }
+          },
+          "properties": {},
+          "ignore_unknown_instances": null,
+          "path": null
+        }
+      ]
+    },
+    "3b5af13f-c997-4009-915c-0810b0e83032": {
       "ignore_unknown_instances": true,
       "source_path": null,
       "project_definition": [
@@ -146,97 +237,6 @@
           "path": null
         }
       ]
-    },
-    "1aafa29b-bdca-40a0-a677-7ead327b84ce": {
-      "ignore_unknown_instances": false,
-      "source_path": "a",
-      "project_definition": [
-        "Ack",
-        {
-          "class_name": null,
-          "children": {},
-          "properties": {},
-          "ignore_unknown_instances": null,
-          "path": "a"
-        }
-      ]
-    },
-    "b1c9928c-bf11-427f-90eb-b672c811d859": {
-      "ignore_unknown_instances": false,
-      "source_path": "b",
-      "project_definition": [
-        "Bar",
-        {
-          "class_name": null,
-          "children": {},
-          "properties": {},
-          "ignore_unknown_instances": null,
-          "path": "b"
-        }
-      ]
-    },
-    "54f2f276-964f-4c60-87d8-5fb2209c97c9": {
-      "ignore_unknown_instances": false,
-      "source_path": "a/foo.txt",
-      "project_definition": null
-    },
-    "9f141826-14c2-492b-b360-2558712f0c08": {
-      "ignore_unknown_instances": true,
-      "source_path": null,
-      "project_definition": [
-        "ReplicatedStorage",
-        {
-          "class_name": "ReplicatedStorage",
-          "children": {
-            "Ack": {
-              "class_name": null,
-              "children": {},
-              "properties": {},
-              "ignore_unknown_instances": null,
-              "path": "a"
-            },
-            "Bar": {
-              "class_name": null,
-              "children": {},
-              "properties": {},
-              "ignore_unknown_instances": null,
-              "path": "b"
-            }
-          },
-          "properties": {},
-          "ignore_unknown_instances": null,
-          "path": null
-        }
-      ]
-    },
-    "8d44bb30-db3c-4366-a6c5-633bd1441885": {
-      "ignore_unknown_instances": false,
-      "source_path": "a/main.lua",
-      "project_definition": null
-    },
-    "b1298bcc-e370-44a6-9ef4-fbefa290124c": {
-      "ignore_unknown_instances": true,
-      "source_path": null,
-      "project_definition": [
-        "HttpService",
-        {
-          "class_name": "HttpService",
-          "children": {},
-          "properties": {
-            "HttpEnabled": {
-              "Type": "Bool",
-              "Value": true
-            }
-          },
-          "ignore_unknown_instances": null,
-          "path": null
-        }
-      ]
-    },
-    "8d690a2a-e987-4c86-b9ac-18e6d3a98503": {
-      "ignore_unknown_instances": false,
-      "source_path": "b/something.lua",
-      "project_definition": null
     }
   }
 }
\ No newline at end of file
diff --git a/test-projects/multi_partition_game/with_dir.tree.json b/test-projects/multi_partition_game/with_dir.tree.json
index 5237c507..c8875416 100644
--- a/test-projects/multi_partition_game/with_dir.tree.json
+++ b/test-projects/multi_partition_game/with_dir.tree.json
@@ -1,6 +1,14 @@
 {
   "instances": {
-    "8d44bb30-db3c-4366-a6c5-633bd1441885": {
+    "b48b369f-5706-4029-9fa6-90651a4910ea": {
+      "Name": "added",
+      "ClassName": "Folder",
+      "Properties": {},
+      "Id": "b48b369f-5706-4029-9fa6-90651a4910ea",
+      "Children": [],
+      "Parent": "14fed1a3-ba97-46a6-ae93-ac26bd9471df"
+    },
+    "00f207b1-fc18-4088-a45e-caf8cd98f5dd": {
       "Name": "main",
       "ClassName": "ModuleScript",
       "Properties": {
@@ -9,77 +17,33 @@
           "Value": "-- hello, from a/main.lua"
         }
       },
-      "Id": "8d44bb30-db3c-4366-a6c5-633bd1441885",
+      "Id": "00f207b1-fc18-4088-a45e-caf8cd98f5dd",
       "Children": [],
-      "Parent": "1aafa29b-bdca-40a0-a677-7ead327b84ce"
+      "Parent": "14fed1a3-ba97-46a6-ae93-ac26bd9471df"
     },
-    "b1c9928c-bf11-427f-90eb-b672c811d859": {
+    "14fed1a3-ba97-46a6-ae93-ac26bd9471df": {
+      "Name": "Ack",
+      "ClassName": "Folder",
+      "Properties": {},
+      "Id": "14fed1a3-ba97-46a6-ae93-ac26bd9471df",
+      "Children": [
+        "b48b369f-5706-4029-9fa6-90651a4910ea",
+        "c55fd55c-258e-4a93-a63a-ea243038c9b9",
+        "00f207b1-fc18-4088-a45e-caf8cd98f5dd"
+      ],
+      "Parent": "99eefe5f-ef74-49e6-8a8b-c833e00ca56b"
+    },
+    "c910510c-37a8-4fd8-ae41-01169ccb739c": {
       "Name": "Bar",
       "ClassName": "Folder",
       "Properties": {},
-      "Id": "b1c9928c-bf11-427f-90eb-b672c811d859",
+      "Id": "c910510c-37a8-4fd8-ae41-01169ccb739c",
       "Children": [
-        "8d690a2a-e987-4c86-b9ac-18e6d3a98503"
+        "71a95983-c856-4cf2-aee6-bd8a523e80e4"
       ],
-      "Parent": "9f141826-14c2-492b-b360-2558712f0c08"
+      "Parent": "99eefe5f-ef74-49e6-8a8b-c833e00ca56b"
     },
-    "645ba594-4482-441f-9f41-5bb9c444405b": {
-      "Name": "multi_partition_game",
-      "ClassName": "DataModel",
-      "Properties": {},
-      "Id": "645ba594-4482-441f-9f41-5bb9c444405b",
-      "Children": [
-        "b1298bcc-e370-44a6-9ef4-fbefa290124c",
-        "9f141826-14c2-492b-b360-2558712f0c08"
-      ],
-      "Parent": null
-    },
-    "9f141826-14c2-492b-b360-2558712f0c08": {
-      "Name": "ReplicatedStorage",
-      "ClassName": "ReplicatedStorage",
-      "Properties": {},
-      "Id": "9f141826-14c2-492b-b360-2558712f0c08",
-      "Children": [
-        "1aafa29b-bdca-40a0-a677-7ead327b84ce",
-        "b1c9928c-bf11-427f-90eb-b672c811d859"
-      ],
-      "Parent": "645ba594-4482-441f-9f41-5bb9c444405b"
-    },
-    "8d690a2a-e987-4c86-b9ac-18e6d3a98503": {
-      "Name": "something",
-      "ClassName": "ModuleScript",
-      "Properties": {
-        "Source": {
-          "Type": "String",
-          "Value": "-- b/something.lua"
-        }
-      },
-      "Id": "8d690a2a-e987-4c86-b9ac-18e6d3a98503",
-      "Children": [],
-      "Parent": "b1c9928c-bf11-427f-90eb-b672c811d859"
-    },
-    "b1298bcc-e370-44a6-9ef4-fbefa290124c": {
-      "Name": "HttpService",
-      "ClassName": "HttpService",
-      "Properties": {
-        "HttpEnabled": {
-          "Type": "Bool",
-          "Value": true
-        }
-      },
-      "Id": "b1298bcc-e370-44a6-9ef4-fbefa290124c",
-      "Children": [],
-      "Parent": "645ba594-4482-441f-9f41-5bb9c444405b"
-    },
-    "46353305-8818-48fe-94fd-80cf0c5d974c": {
-      "Name": "added",
-      "ClassName": "Folder",
-      "Properties": {},
-      "Id": "46353305-8818-48fe-94fd-80cf0c5d974c",
-      "Children": [],
-      "Parent": "1aafa29b-bdca-40a0-a677-7ead327b84ce"
-    },
-    "54f2f276-964f-4c60-87d8-5fb2209c97c9": {
+    "c55fd55c-258e-4a93-a63a-ea243038c9b9": {
       "Name": "foo",
       "ClassName": "StringValue",
       "Properties": {
@@ -88,50 +52,67 @@
           "Value": "Hello world, from a/foo.txt"
         }
       },
-      "Id": "54f2f276-964f-4c60-87d8-5fb2209c97c9",
+      "Id": "c55fd55c-258e-4a93-a63a-ea243038c9b9",
       "Children": [],
-      "Parent": "1aafa29b-bdca-40a0-a677-7ead327b84ce"
+      "Parent": "14fed1a3-ba97-46a6-ae93-ac26bd9471df"
     },
-    "1aafa29b-bdca-40a0-a677-7ead327b84ce": {
-      "Name": "Ack",
-      "ClassName": "Folder",
+    "71a95983-c856-4cf2-aee6-bd8a523e80e4": {
+      "Name": "something",
+      "ClassName": "ModuleScript",
+      "Properties": {
+        "Source": {
+          "Type": "String",
+          "Value": "-- b/something.lua"
+        }
+      },
+      "Id": "71a95983-c856-4cf2-aee6-bd8a523e80e4",
+      "Children": [],
+      "Parent": "c910510c-37a8-4fd8-ae41-01169ccb739c"
+    },
+    "3b5af13f-c997-4009-915c-0810b0e83032": {
+      "Name": "multi_partition_game",
+      "ClassName": "DataModel",
       "Properties": {},
-      "Id": "1aafa29b-bdca-40a0-a677-7ead327b84ce",
+      "Id": "3b5af13f-c997-4009-915c-0810b0e83032",
       "Children": [
-        "54f2f276-964f-4c60-87d8-5fb2209c97c9",
-        "8d44bb30-db3c-4366-a6c5-633bd1441885",
-        "46353305-8818-48fe-94fd-80cf0c5d974c"
+        "bf8e2d4f-33a0-42a0-8168-1b62d6ac050c",
+        "99eefe5f-ef74-49e6-8a8b-c833e00ca56b"
       ],
-      "Parent": "9f141826-14c2-492b-b360-2558712f0c08"
+      "Parent": null
+    },
+    "bf8e2d4f-33a0-42a0-8168-1b62d6ac050c": {
+      "Name": "HttpService",
+      "ClassName": "HttpService",
+      "Properties": {
+        "HttpEnabled": {
+          "Type": "Bool",
+          "Value": true
+        }
+      },
+      "Id": "bf8e2d4f-33a0-42a0-8168-1b62d6ac050c",
+      "Children": [],
+      "Parent": "3b5af13f-c997-4009-915c-0810b0e83032"
+    },
+    "99eefe5f-ef74-49e6-8a8b-c833e00ca56b": {
+      "Name": "ReplicatedStorage",
+      "ClassName": "ReplicatedStorage",
+      "Properties": {},
+      "Id": "99eefe5f-ef74-49e6-8a8b-c833e00ca56b",
+      "Children": [
+        "14fed1a3-ba97-46a6-ae93-ac26bd9471df",
+        "c910510c-37a8-4fd8-ae41-01169ccb739c"
+      ],
+      "Parent": "3b5af13f-c997-4009-915c-0810b0e83032"
     }
   },
-  "root_id": "645ba594-4482-441f-9f41-5bb9c444405b",
+  "root_id": "3b5af13f-c997-4009-915c-0810b0e83032",
   "metadata": {
-    "b1c9928c-bf11-427f-90eb-b672c811d859": {
-      "ignore_unknown_instances": false,
-      "source_path": "b",
-      "project_definition": [
-        "Bar",
-        {
-          "class_name": null,
-          "children": {},
-          "properties": {},
-          "ignore_unknown_instances": null,
-          "path": "b"
-        }
-      ]
-    },
-    "54f2f276-964f-4c60-87d8-5fb2209c97c9": {
+    "c55fd55c-258e-4a93-a63a-ea243038c9b9": {
       "ignore_unknown_instances": false,
       "source_path": "a/foo.txt",
       "project_definition": null
     },
-    "8d44bb30-db3c-4366-a6c5-633bd1441885": {
-      "ignore_unknown_instances": false,
-      "source_path": "a/main.lua",
-      "project_definition": null
-    },
-    "9f141826-14c2-492b-b360-2558712f0c08": {
+    "99eefe5f-ef74-49e6-8a8b-c833e00ca56b": {
       "ignore_unknown_instances": true,
       "source_path": null,
       "project_definition": [
@@ -160,7 +141,17 @@
         }
       ]
     },
-    "b1298bcc-e370-44a6-9ef4-fbefa290124c": {
+    "71a95983-c856-4cf2-aee6-bd8a523e80e4": {
+      "ignore_unknown_instances": false,
+      "source_path": "b/something.lua",
+      "project_definition": null
+    },
+    "00f207b1-fc18-4088-a45e-caf8cd98f5dd": {
+      "ignore_unknown_instances": false,
+      "source_path": "a/main.lua",
+      "project_definition": null
+    },
+    "bf8e2d4f-33a0-42a0-8168-1b62d6ac050c": {
       "ignore_unknown_instances": true,
       "source_path": null,
       "project_definition": [
@@ -179,31 +170,12 @@
         }
       ]
     },
-    "46353305-8818-48fe-94fd-80cf0c5d974c": {
+    "b48b369f-5706-4029-9fa6-90651a4910ea": {
       "ignore_unknown_instances": false,
       "source_path": "a/added",
       "project_definition": null
     },
-    "1aafa29b-bdca-40a0-a677-7ead327b84ce": {
-      "ignore_unknown_instances": false,
-      "source_path": "a",
-      "project_definition": [
-        "Ack",
-        {
-          "class_name": null,
-          "children": {},
-          "properties": {},
-          "ignore_unknown_instances": null,
-          "path": "a"
-        }
-      ]
-    },
-    "8d690a2a-e987-4c86-b9ac-18e6d3a98503": {
-      "ignore_unknown_instances": false,
-      "source_path": "b/something.lua",
-      "project_definition": null
-    },
-    "645ba594-4482-441f-9f41-5bb9c444405b": {
+    "3b5af13f-c997-4009-915c-0810b0e83032": {
       "ignore_unknown_instances": true,
       "source_path": null,
       "project_definition": [
@@ -251,6 +223,34 @@
           "path": null
         }
       ]
+    },
+    "c910510c-37a8-4fd8-ae41-01169ccb739c": {
+      "ignore_unknown_instances": false,
+      "source_path": "b",
+      "project_definition": [
+        "Bar",
+        {
+          "class_name": null,
+          "children": {},
+          "properties": {},
+          "ignore_unknown_instances": null,
+          "path": "b"
+        }
+      ]
+    },
+    "14fed1a3-ba97-46a6-ae93-ac26bd9471df": {
+      "ignore_unknown_instances": false,
+      "source_path": "a",
+      "project_definition": [
+        "Ack",
+        {
+          "class_name": null,
+          "children": {},
+          "properties": {},
+          "ignore_unknown_instances": null,
+          "path": "a"
+        }
+      ]
     }
   }
 }
\ No newline at end of file
diff --git a/test-projects/multi_partition_game/with_moved_dir.tree.json b/test-projects/multi_partition_game/with_moved_dir.tree.json
index 4da8884a..4e996829 100644
--- a/test-projects/multi_partition_game/with_moved_dir.tree.json
+++ b/test-projects/multi_partition_game/with_moved_dir.tree.json
@@ -1,6 +1,14 @@
 {
   "instances": {
-    "8d44bb30-db3c-4366-a6c5-633bd1441885": {
+    "866071d6-465a-4b88-8c63-07489d950916": {
+      "Name": "added",
+      "ClassName": "Folder",
+      "Properties": {},
+      "Id": "866071d6-465a-4b88-8c63-07489d950916",
+      "Children": [],
+      "Parent": "c910510c-37a8-4fd8-ae41-01169ccb739c"
+    },
+    "00f207b1-fc18-4088-a45e-caf8cd98f5dd": {
       "Name": "main",
       "ClassName": "ModuleScript",
       "Properties": {
@@ -9,70 +17,33 @@
           "Value": "-- hello, from a/main.lua"
         }
       },
-      "Id": "8d44bb30-db3c-4366-a6c5-633bd1441885",
+      "Id": "00f207b1-fc18-4088-a45e-caf8cd98f5dd",
       "Children": [],
-      "Parent": "1aafa29b-bdca-40a0-a677-7ead327b84ce"
+      "Parent": "14fed1a3-ba97-46a6-ae93-ac26bd9471df"
     },
-    "b1c9928c-bf11-427f-90eb-b672c811d859": {
+    "14fed1a3-ba97-46a6-ae93-ac26bd9471df": {
+      "Name": "Ack",
+      "ClassName": "Folder",
+      "Properties": {},
+      "Id": "14fed1a3-ba97-46a6-ae93-ac26bd9471df",
+      "Children": [
+        "c55fd55c-258e-4a93-a63a-ea243038c9b9",
+        "00f207b1-fc18-4088-a45e-caf8cd98f5dd"
+      ],
+      "Parent": "99eefe5f-ef74-49e6-8a8b-c833e00ca56b"
+    },
+    "c910510c-37a8-4fd8-ae41-01169ccb739c": {
       "Name": "Bar",
       "ClassName": "Folder",
       "Properties": {},
-      "Id": "b1c9928c-bf11-427f-90eb-b672c811d859",
+      "Id": "c910510c-37a8-4fd8-ae41-01169ccb739c",
       "Children": [
-        "8d690a2a-e987-4c86-b9ac-18e6d3a98503",
-        "a8566e76-0495-45a3-a713-1c59ab39453b"
+        "866071d6-465a-4b88-8c63-07489d950916",
+        "71a95983-c856-4cf2-aee6-bd8a523e80e4"
       ],
-      "Parent": "9f141826-14c2-492b-b360-2558712f0c08"
+      "Parent": "99eefe5f-ef74-49e6-8a8b-c833e00ca56b"
     },
-    "645ba594-4482-441f-9f41-5bb9c444405b": {
-      "Name": "multi_partition_game",
-      "ClassName": "DataModel",
-      "Properties": {},
-      "Id": "645ba594-4482-441f-9f41-5bb9c444405b",
-      "Children": [
-        "b1298bcc-e370-44a6-9ef4-fbefa290124c",
-        "9f141826-14c2-492b-b360-2558712f0c08"
-      ],
-      "Parent": null
-    },
-    "9f141826-14c2-492b-b360-2558712f0c08": {
-      "Name": "ReplicatedStorage",
-      "ClassName": "ReplicatedStorage",
-      "Properties": {},
-      "Id": "9f141826-14c2-492b-b360-2558712f0c08",
-      "Children": [
-        "1aafa29b-bdca-40a0-a677-7ead327b84ce",
-        "b1c9928c-bf11-427f-90eb-b672c811d859"
-      ],
-      "Parent": "645ba594-4482-441f-9f41-5bb9c444405b"
-    },
-    "8d690a2a-e987-4c86-b9ac-18e6d3a98503": {
-      "Name": "something",
-      "ClassName": "ModuleScript",
-      "Properties": {
-        "Source": {
-          "Type": "String",
-          "Value": "-- b/something.lua"
-        }
-      },
-      "Id": "8d690a2a-e987-4c86-b9ac-18e6d3a98503",
-      "Children": [],
-      "Parent": "b1c9928c-bf11-427f-90eb-b672c811d859"
-    },
-    "b1298bcc-e370-44a6-9ef4-fbefa290124c": {
-      "Name": "HttpService",
-      "ClassName": "HttpService",
-      "Properties": {
-        "HttpEnabled": {
-          "Type": "Bool",
-          "Value": true
-        }
-      },
-      "Id": "b1298bcc-e370-44a6-9ef4-fbefa290124c",
-      "Children": [],
-      "Parent": "645ba594-4482-441f-9f41-5bb9c444405b"
-    },
-    "54f2f276-964f-4c60-87d8-5fb2209c97c9": {
+    "c55fd55c-258e-4a93-a63a-ea243038c9b9": {
       "Name": "foo",
       "ClassName": "StringValue",
       "Properties": {
@@ -81,33 +52,158 @@
           "Value": "Hello world, from a/foo.txt"
         }
       },
-      "Id": "54f2f276-964f-4c60-87d8-5fb2209c97c9",
+      "Id": "c55fd55c-258e-4a93-a63a-ea243038c9b9",
       "Children": [],
-      "Parent": "1aafa29b-bdca-40a0-a677-7ead327b84ce"
+      "Parent": "14fed1a3-ba97-46a6-ae93-ac26bd9471df"
     },
-    "a8566e76-0495-45a3-a713-1c59ab39453b": {
-      "Name": "added",
-      "ClassName": "Folder",
-      "Properties": {},
-      "Id": "a8566e76-0495-45a3-a713-1c59ab39453b",
+    "71a95983-c856-4cf2-aee6-bd8a523e80e4": {
+      "Name": "something",
+      "ClassName": "ModuleScript",
+      "Properties": {
+        "Source": {
+          "Type": "String",
+          "Value": "-- b/something.lua"
+        }
+      },
+      "Id": "71a95983-c856-4cf2-aee6-bd8a523e80e4",
       "Children": [],
-      "Parent": "b1c9928c-bf11-427f-90eb-b672c811d859"
+      "Parent": "c910510c-37a8-4fd8-ae41-01169ccb739c"
     },
-    "1aafa29b-bdca-40a0-a677-7ead327b84ce": {
-      "Name": "Ack",
-      "ClassName": "Folder",
+    "3b5af13f-c997-4009-915c-0810b0e83032": {
+      "Name": "multi_partition_game",
+      "ClassName": "DataModel",
       "Properties": {},
-      "Id": "1aafa29b-bdca-40a0-a677-7ead327b84ce",
+      "Id": "3b5af13f-c997-4009-915c-0810b0e83032",
       "Children": [
-        "54f2f276-964f-4c60-87d8-5fb2209c97c9",
-        "8d44bb30-db3c-4366-a6c5-633bd1441885"
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+    },
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+      "Name": "HttpService",
+      "ClassName": "HttpService",
+      "Properties": {
+        "HttpEnabled": {
+          "Type": "Bool",
+          "Value": true
+        }
+      },
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+      "Children": [],
+      "Parent": "3b5af13f-c997-4009-915c-0810b0e83032"
+    },
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+      "Name": "ReplicatedStorage",
+      "ClassName": "ReplicatedStorage",
+      "Properties": {},
+      "Id": "99eefe5f-ef74-49e6-8a8b-c833e00ca56b",
+      "Children": [
+        "14fed1a3-ba97-46a6-ae93-ac26bd9471df",
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+      ],
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   },
-  "root_id": "645ba594-4482-441f-9f41-5bb9c444405b",
+  "root_id": "3b5af13f-c997-4009-915c-0810b0e83032",
   "metadata": {
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+      "ignore_unknown_instances": true,
+      "source_path": null,
+      "project_definition": [
+        "HttpService",
+        {
+          "class_name": "HttpService",
+          "children": {},
+          "properties": {
+            "HttpEnabled": {
+              "Type": "Bool",
+              "Value": true
+            }
+          },
+          "ignore_unknown_instances": null,
+          "path": null
+        }
+      ]
+    },
+    "c910510c-37a8-4fd8-ae41-01169ccb739c": {
+      "ignore_unknown_instances": false,
+      "source_path": "b",
+      "project_definition": [
+        "Bar",
+        {
+          "class_name": null,
+          "children": {},
+          "properties": {},
+          "ignore_unknown_instances": null,
+          "path": "b"
+        }
+      ]
+    },
+    "866071d6-465a-4b88-8c63-07489d950916": {
+      "ignore_unknown_instances": false,
+      "source_path": "b/added",
+      "project_definition": null
+    },
+    "14fed1a3-ba97-46a6-ae93-ac26bd9471df": {
+      "ignore_unknown_instances": false,
+      "source_path": "a",
+      "project_definition": [
+        "Ack",
+        {
+          "class_name": null,
+          "children": {},
+          "properties": {},
+          "ignore_unknown_instances": null,
+          "path": "a"
+        }
+      ]
+    },
+    "00f207b1-fc18-4088-a45e-caf8cd98f5dd": {
+      "ignore_unknown_instances": false,
+      "source_path": "a/main.lua",
+      "project_definition": null
+    },
+    "99eefe5f-ef74-49e6-8a8b-c833e00ca56b": {
+      "ignore_unknown_instances": true,
+      "source_path": null,
+      "project_definition": [
+        "ReplicatedStorage",
+        {
+          "class_name": "ReplicatedStorage",
+          "children": {
+            "Ack": {
+              "class_name": null,
+              "children": {},
+              "properties": {},
+              "ignore_unknown_instances": null,
+              "path": "a"
+            },
+            "Bar": {
+              "class_name": null,
+              "children": {},
+              "properties": {},
+              "ignore_unknown_instances": null,
+              "path": "b"
+            }
+          },
+          "properties": {},
+          "ignore_unknown_instances": null,
+          "path": null
+        }
+      ]
+    },
+    "71a95983-c856-4cf2-aee6-bd8a523e80e4": {
+      "ignore_unknown_instances": false,
+      "source_path": "b/something.lua",
+      "project_definition": null
+    },
+    "c55fd55c-258e-4a93-a63a-ea243038c9b9": {
+      "ignore_unknown_instances": false,
+      "source_path": "a/foo.txt",
+      "project_definition": null
+    },
+    "3b5af13f-c997-4009-915c-0810b0e83032": {
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       "source_path": null,
       "project_definition": [
@@ -155,102 +251,6 @@
           "path": null
         }
       ]
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-      "project_definition": [
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-        {
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-          "children": {},
-          "properties": {},
-          "ignore_unknown_instances": null,
-          "path": "a"
-        }
-      ]
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-      "source_path": "b/added",
-      "project_definition": null
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-      "source_path": "b/something.lua",
-      "project_definition": null
-    },
-    "8d44bb30-db3c-4366-a6c5-633bd1441885": {
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-      "source_path": "a/main.lua",
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-      "project_definition": [
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-          "children": {
-            "Ack": {
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-              "children": {},
-              "properties": {},
-              "ignore_unknown_instances": null,
-              "path": "a"
-            },
-            "Bar": {
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-              "children": {},
-              "properties": {},
-              "ignore_unknown_instances": null,
-              "path": "b"
-            }
-          },
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-    },
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-      "source_path": "b",
-      "project_definition": [
-        "Bar",
-        {
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-          "children": {},
-          "properties": {},
-          "ignore_unknown_instances": null,
-          "path": "b"
-        }
-      ]
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-      "source_path": "a/foo.txt",
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-        {
-          "class_name": "HttpService",
-          "children": {},
-          "properties": {
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-              "Value": true
-            }
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   }
 }
\ No newline at end of file