src/app/editor/[projectId]/FlowchartEditor.tsx

@@ -1143,6 +1143,9 @@ function FlowchartEditorInner({ projectId, projectName, userId, userDisplayName,
       // Update last saved data ref to mark as not dirty
       lastSavedDataRef.current = flowchartData
 
+      // Broadcast full CRDT state so other connected clients sync up
+      crdtRef.current?.broadcastFullState()
+
       setToast({ message: 'Project saved successfully', type: 'success' })
     } catch (error) {
       console.error('Failed to save project:', error)

src/lib/collaboration/crdt.ts

@@ -173,6 +173,17 @@ export class CRDTManager {
     this.callbacks.onEdgesChange(this.getEdges())
   }
 
+  /** Broadcast the full document state to sync all connected clients */
+  broadcastFullState(): void {
+    if (!this.channel || this.isDestroyed) return
+    const fullState = Y.encodeStateAsUpdate(this.doc)
+    this.channel.send({
+      type: 'broadcast',
+      event: BROADCAST_EVENT,
+      payload: { update: Array.from(fullState) },
+    })
+  }
+
   private broadcastUpdate(update: Uint8Array): void {
     if (!this.channel || this.isDestroyed) return
     this.channel.send({