diff --git a/src/json-crdt-extensions/peritext/util/__tests__/ChunkSlice.spec.ts b/src/json-crdt-extensions/peritext/util/__tests__/ChunkSlice.spec.ts
index 365ed1b867..5183b2ed9a 100644
--- a/src/json-crdt-extensions/peritext/util/__tests__/ChunkSlice.spec.ts
+++ b/src/json-crdt-extensions/peritext/util/__tests__/ChunkSlice.spec.ts
@@ -3,7 +3,7 @@ import {Model} from '../../../../json-crdt/model';
 import {ChunkSlice} from '../ChunkSlice';
 
 const setup = () => {
-  const model = Model.withLogicalClock().setSchema(s.str('Hello world'));
+  const model = Model.withLogicalClock().setSchema(s.str('Hello world'), false);
   const node = model.root.node();
   const chunk = node.first()!;
   return {
diff --git a/src/json-crdt/model/Model.ts b/src/json-crdt/model/Model.ts
index 51c82481d8..9aaba10f9d 100644
--- a/src/json-crdt/model/Model.ts
+++ b/src/json-crdt/model/Model.ts
@@ -403,13 +403,16 @@ export class Model<N extends JsonNode = JsonNode<any>> implements Printable {
    * @returns Strictly typed model.
    */
   public setSchema<S extends NodeBuilder>(schema: S, useGlobalSession: boolean = true): Model<SchemaToJsonNode<S>> {
-    const clock = this.clock;
-    const sid = useGlobalSession ? SESSION.GLOBAL : clock.sid;
-    if (clock.time < 2) {
-      const oldSid = clock.sid;
-      clock.sid = sid;
+    const c = this.clock;
+    const isNewDocument = c.time === 1;
+    if (isNewDocument) {
+      const oldSid = c.sid;
+      if (useGlobalSession) c.sid = SESSION.GLOBAL;
       this.api.root(schema);
-      clock.sid = oldSid;
+      if (useGlobalSession) {
+        c.sid = oldSid;
+        c.observe(new clock.Timestamp(SESSION.GLOBAL, c.time - 1), 1);
+      }
     }
     return <any>this;
   }