diff --git a/core/frontend/src/App.tsx b/core/frontend/src/App.tsx
index 39e0203..635376e 100644
--- a/core/frontend/src/App.tsx
+++ b/core/frontend/src/App.tsx
@@ -567,7 +567,13 @@ export function App() {
             onBack={() => navigate("projects")}
             onCreate={async (payload) => {
               const created = await action(() => api.createProject(payload), "项目已创建");
-              if (created) navigate("pipeline", { projectId: created.id });
+              if (created) {
+                // 立刻把新项目落到 detail/列表,避免后台 hydrate 期间 pipeline 先闪出旧项目数据
+                // (旧项目的脚本会污染新项目的脚本助手 chat)
+                setProjectDetail(created);
+                setProjects((prev) => (prev.some((p) => p.id === created.id) ? prev : [created, ...prev]));
+                navigate("pipeline", { projectId: created.id });
+              }
             }}
             onCreateProduct={(payload) => action(() => api.createProduct(payload), "")}
           />
@@ -657,6 +663,7 @@ export function App() {
     const textModel = modelConfigs.find((m) => m.capability === "text" && m.status === "active") || modelConfigs.find((m) => m.capability === "text");
     return (
       <PipelinePage
+        key={pipelineProject.id}
         project={pipelineProject}
         scriptModelName={textModel?.display_name || textModel?.name || "AI"}
         loading={loading}
diff --git a/core/frontend/src/routes/pipeline.tsx b/core/frontend/src/routes/pipeline.tsx
index 3b47b14..fb569e8 100644
--- a/core/frontend/src/routes/pipeline.tsx
+++ b/core/frontend/src/routes/pipeline.tsx
@@ -573,7 +573,7 @@ export function PipelinePage(props: {
   const chatBodyRef = useRef<HTMLDivElement | null>(null);
   // 对话记录(本地会话态):生成动作可追溯,不再是「点了按钮、对话区永远空着」
   // kind=progress:进度提示流(行33),steps 逐条滚动出现,done 后折叠成一行结果
-  type ChatMsg = { id: number; role: "ai" | "user"; text: string; time: string; kind?: "progress"; steps?: string[]; done?: boolean };
+  type ChatMsg = { id: number; role: "ai" | "user"; text: string; time: string; kind?: "progress"; steps?: string[]; done?: boolean; auto?: boolean };
   const nowHm = () => new Date().toTimeString().slice(0, 5);
   const msgIdRef = useRef(1);
   const nextMsgId = () => msgIdRef.current++;
@@ -591,13 +591,14 @@ export function PipelinePage(props: {
       }
     } catch { /* 解析失败则回退默认 */ }
     return currentScript
-      ? [{ id: nextMsgId(), role: "ai", text: `当前已有 ${currentScript.segments?.length ?? 0} 镜脚本(${currentScript.is_adopted ? "已采用" : "待采用"})。直接输入修改意见可整体重写。`, time: nowHm() }]
+      ? [{ id: nextMsgId(), role: "ai", auto: true, text: `当前已有 ${currentScript.segments?.length ?? 0} 镜脚本(${currentScript.is_adopted ? "已采用" : "待采用"})。直接输入修改意见可整体重写。`, time: nowHm() }]
       : [];
   });
-  // 落盘:丢掉未完成的 progress 流(那是临时态),只保留最近 60 条
+  // 落盘:auto 派生提示(「已有N镜」)不落盘——它跟当前脚本状态绑定,持久化会在切项目时串台;
+  // 未完成的 progress 流也不落盘(临时态);只保留最近 60 条真实对话
   useEffect(() => {
     try {
-      const slim = chatMsgs.filter((m) => m.kind !== "progress" || m.done).slice(-60);
+      const slim = chatMsgs.filter((m) => !m.auto && (m.kind !== "progress" || m.done)).slice(-60);
       localStorage.setItem(chatKey, JSON.stringify(slim));
     } catch { /* localStorage 不可用则忽略 */ }
   }, [chatKey, chatMsgs]);