diff --git a/web/hwlab-cloud-web/src/stores/workbench.ts b/web/hwlab-cloud-web/src/stores/workbench.ts
index 5e80774f..caaeed44 100644
--- a/web/hwlab-cloud-web/src/stores/workbench.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench.ts
@@ -627,9 +627,10 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const traceId = firstNonEmptyString(message.traceId, message.runnerTrace?.traceId, previous?.traceId, previous?.runnerTrace?.traceId);
     const authority = traceId ? traceAuthorityById.value[traceId] ?? null : null;
     const preservedTrace = authority ?? previous?.runnerTrace ?? null;
-    if (!preservedTrace) return message;
+    const terminalSealPatch = messageTerminalSealPatchForProjectionMerge(message, previous);
+    if (!preservedTrace) return { ...message, ...terminalSealPatch };
     const runnerTrace = message.runnerTrace ? mergeRunnerTrace(message.runnerTrace, preservedTrace) : preservedTrace;
-    return { ...message, ...messageTimingPatch(message), runnerTrace };
+    return { ...message, ...terminalSealPatch, runnerTrace };
   }
 
   function findExistingProjectionMessage(message: ChatMessage, existing: ChatMessage[]): ChatMessage | null {
@@ -1868,6 +1869,16 @@ function messageTimingPatchForMerge(message: ChatMessage, value: unknown): Parti
   return messageTimingPatch(message);
 }
 
+function messageTerminalSealPatchForProjectionMerge(message: ChatMessage, previous: ChatMessage | null): Partial<ChatMessage> {
+  const incomingTimingPatch = messageTimingPatch(message);
+  if (!previous || !isTerminalMessageStatus(previous.status)) return incomingTimingPatch;
+  const patch: Partial<ChatMessage> = { status: previous.status, traceAutoLifecycle: previous.traceAutoLifecycle ?? "terminal" };
+  if (typeof previous.text === "string" && previous.text.trim()) patch.text = previous.text;
+  const previousTiming = normalizeTimingProjection(previous);
+  if (previousTiming?.durationMs == null) return { ...incomingTimingPatch, ...patch };
+  return { ...messageTimingPatch(previous), ...patch };
+}
+
 function messageStatusPatchForTerminalMerge(message: ChatMessage, resultStatus: string | null, terminal: boolean): Partial<ChatMessage> {
   if (!terminal || isTerminalMessageStatus(message.status)) return {};
   if (resultStatus && isTerminalMessageStatus(resultStatus)) return { status: resultStatus as ChatMessage["status"] };