fix(hydration): duplicate overlay after idle + subblocks race condition

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/workflow.tsx

@@ -887,14 +887,10 @@ const WorkflowContent = React.memo(() => {
     // 2. The workflow exists in the registry
     // 3. Workflows are not currently loading
     if (hasActiveWorkflow && hasWorkflowInRegistry && isNotLoading) {
-      // Add a small delay to ensure blocks state has settled
-      const timeoutId = setTimeout(() => {
-        setIsWorkflowReady(true)
-      }, 100)
-
-      return () => clearTimeout(timeoutId)
+      setIsWorkflowReady(true)
+    } else {
+      setIsWorkflowReady(false)
     }
-    setIsWorkflowReady(false)
   }, [activeWorkflowId, params.workflowId, workflows, isLoading])
 
   // Init workflow

apps/sim/contexts/socket-context.tsx

@@ -376,38 +376,24 @@ export function SocketProvider({ children, user }: SocketProviderProps) {
                         )
                       })
 
-                      // Merge workflow store with server state (do not drop optimistic local state)
-                      const existing = useWorkflowStore.getState()
-                      const mergedBlocks = {
-                        ...(existing.blocks || {}),
-                        ...(workflowState.blocks || {}),
-                      }
-                      const edgeById = new Map<string, any>()
-                      ;(existing.edges || []).forEach((e: any) => edgeById.set(e.id, e))
-                      ;(workflowState.edges || []).forEach((e: any) => edgeById.set(e.id, e))
-                      const mergedEdges = Array.from(edgeById.values())
+                      // Replace local workflow store with authoritative server state
                       useWorkflowStore.setState({
-                        blocks: mergedBlocks,
-                        edges: mergedEdges,
-                        loops: workflowState.loops || existing.loops || {},
-                        parallels: workflowState.parallels || existing.parallels || {},
-                        lastSaved: workflowState.lastSaved || existing.lastSaved || Date.now(),
-                        isDeployed: workflowState.isDeployed ?? existing.isDeployed ?? false,
-                        deployedAt: workflowState.deployedAt || existing.deployedAt,
-                        deploymentStatuses:
-                          workflowState.deploymentStatuses || existing.deploymentStatuses || {},
-                        hasActiveWebhook:
-                          workflowState.hasActiveWebhook ?? existing.hasActiveWebhook ?? false,
+                        blocks: workflowState.blocks || {},
+                        edges: workflowState.edges || [],
+                        loops: workflowState.loops || {},
+                        parallels: workflowState.parallels || {},
+                        lastSaved: workflowState.lastSaved || Date.now(),
+                        isDeployed: workflowState.isDeployed ?? false,
+                        deployedAt: workflowState.deployedAt,
+                        deploymentStatuses: workflowState.deploymentStatuses || {},
+                        hasActiveWebhook: workflowState.hasActiveWebhook ?? false,
                       })
 
-                      // Merge subblock store values per workflow
+                      // Replace subblock store values for this workflow
                       useSubBlockStore.setState((state: any) => ({
                         workflowValues: {
                           ...state.workflowValues,
-                          [data.workflowId]: {
-                            ...(state.workflowValues?.[data.workflowId] || {}),
-                            ...subblockValues,
-                          },
+                          [data.workflowId]: subblockValues,
                         },
                       }))
 
@@ -518,36 +504,24 @@ export function SocketProvider({ children, user }: SocketProviderProps) {
                     })
                   })
 
-                  const existing = useWorkflowStore.getState()
-                  const mergedBlocks = {
-                    ...(existing.blocks || {}),
-                    ...(workflowState.blocks || {}),
-                  }
-                  const edgeById = new Map<string, any>()
-                  ;(existing.edges || []).forEach((e: any) => edgeById.set(e.id, e))
-                  ;(workflowState.edges || []).forEach((e: any) => edgeById.set(e.id, e))
-                  const mergedEdges = Array.from(edgeById.values())
+                  // Replace local workflow store with authoritative server state
                   useWorkflowStore.setState({
-                    blocks: mergedBlocks,
-                    edges: mergedEdges,
-                    loops: workflowState.loops || existing.loops || {},
-                    parallels: workflowState.parallels || existing.parallels || {},
-                    lastSaved: workflowState.lastSaved || existing.lastSaved || Date.now(),
-                    isDeployed: workflowState.isDeployed ?? existing.isDeployed ?? false,
-                    deployedAt: workflowState.deployedAt || existing.deployedAt,
-                    deploymentStatuses:
-                      workflowState.deploymentStatuses || existing.deploymentStatuses || {},
-                    hasActiveWebhook:
-                      workflowState.hasActiveWebhook ?? existing.hasActiveWebhook ?? false,
+                    blocks: workflowState.blocks || {},
+                    edges: workflowState.edges || [],
+                    loops: workflowState.loops || {},
+                    parallels: workflowState.parallels || {},
+                    lastSaved: workflowState.lastSaved || Date.now(),
+                    isDeployed: workflowState.isDeployed ?? false,
+                    deployedAt: workflowState.deployedAt,
+                    deploymentStatuses: workflowState.deploymentStatuses || {},
+                    hasActiveWebhook: workflowState.hasActiveWebhook ?? false,
                   })
 
+                  // Replace subblock store values for this workflow
                   useSubBlockStore.setState((state: any) => ({
                     workflowValues: {
                       ...state.workflowValues,
-                      [workflowData.id]: {
-                        ...(state.workflowValues?.[workflowData.id] || {}),
-                        ...subblockValues,
-                      },
+                      [workflowData.id]: subblockValues,
                     },
                   }))
 

apps/sim/stores/workflows/registry/store.ts

@@ -124,27 +124,6 @@ async function fetchWorkflowsFromDB(workspaceId?: string): Promise<void> {
         }
       }
 
-      // Initialize subblock values
-      const subblockValues: Record<string, Record<string, any>> = {}
-      if (state?.blocks) {
-        Object.entries(state.blocks).forEach(([blockId, block]) => {
-          const blockState = block as BlockState
-          subblockValues[blockId] = {}
-
-          Object.entries(blockState.subBlocks || {}).forEach(([subblockId, subblock]) => {
-            subblockValues[blockId][subblockId] = subblock.value
-          })
-        })
-      }
-
-      // Update subblock store
-      useSubBlockStore.setState((state) => ({
-        workflowValues: {
-          ...state.workflowValues,
-          [id]: subblockValues,
-        },
-      }))
-
       if (variables && typeof variables === 'object') {
         useVariablesStore.setState((state) => {
           const withoutWorkflow = Object.fromEntries(
@@ -506,22 +485,7 @@ export const useWorkflowRegistry = create<WorkflowRegistry>()(
             },
           }
 
-          // Extract and update subblock values
-          const subblockValues: Record<string, Record<string, any>> = {}
-          Object.entries(workflowState.blocks).forEach(([blockId, block]) => {
-            const blockState = block as any
-            subblockValues[blockId] = {}
-            Object.entries(blockState.subBlocks || {}).forEach(([subblockId, subblock]) => {
-              subblockValues[blockId][subblockId] = (subblock as any).value
-            })
-          })
-
-          useSubBlockStore.setState((state) => ({
-            workflowValues: {
-              ...state.workflowValues,
-              [id]: subblockValues,
-            },
-          }))
+          // Subblock values will be initialized by initializeFromWorkflow below
         } else {
           // If no state in DB, use empty state - server should have created start block
           workflowState = {

apps/sim/stores/workflows/subblock/store.ts

@@ -103,7 +103,7 @@ export const useSubBlockStore = create<SubBlockStore>()(
       const values: Record<string, Record<string, any>> = {}
       Object.entries(blocks).forEach(([blockId, block]) => {
         values[blockId] = {}
-        Object.entries(block.subBlocks).forEach(([subBlockId, subBlock]) => {
+        Object.entries(block.subBlocks || {}).forEach(([subBlockId, subBlock]) => {
           values[blockId][subBlockId] = (subBlock as SubBlockConfig).value
         })
       })