diff --git a/desktop/frontend-next/src/ui/WorktreeChip.mount.test.tsx b/desktop/frontend-next/src/ui/WorktreeChip.mount.test.tsx
new file mode 100644
index 0000000000..08859010a6
--- /dev/null
+++ b/desktop/frontend-next/src/ui/WorktreeChip.mount.test.tsx
@@ -0,0 +1,33 @@
+// @vitest-environment jsdom
+import { createRoot } from "react-dom/client";
+import { afterEach, expect, it, vi } from "vitest";
+import { MockPort } from "../port/mock";
+import { WorktreeChip } from "./WorktreeChip";
+import type { AgentPort } from "../port/port";
+
+const root = document.createElement("div");
+let mounted: ReturnType<typeof createRoot> | null = null;
+afterEach(() => { mounted?.unmount(); mounted = null; root.remove(); delete (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT; });
+
+it("keeps open a menu opened between the chip's commit and its mount effects", async () => {
+  (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = false;
+  document.body.append(root);
+  const port = new MockPort() as AgentPort;
+  const sources = { available: false, sourceRoot: "/w", sources: [] };
+  mounted = createRoot(root);
+  const clicked = new Promise<void>((resolve) => {
+    const watch = new MutationObserver(() => {
+      const button = root.querySelector<HTMLButtonElement>("button.worktree-trigger");
+      if (!button) return;
+      watch.disconnect();
+      button.click();
+      resolve();
+    });
+    watch.observe(root, { childList: true, subtree: true });
+  });
+  mounted.render(<WorktreeChip port={port} sources={sources} canCreate={false} selection={null} branch="main" busy={false}
+    changeCount={0} onSelect={vi.fn()} refresh={async () => sources} onChanged={vi.fn()} onError={vi.fn()} />);
+  await clicked;
+  await new Promise((resolve) => setTimeout(resolve, 100));
+  expect(root.querySelector("button.worktree-trigger")?.getAttribute("aria-expanded")).toBe("true");
+});
diff --git a/desktop/frontend-next/src/ui/WorktreeChip.tsx b/desktop/frontend-next/src/ui/WorktreeChip.tsx
index ced5ef3b46..aa816d0dfe 100644
--- a/desktop/frontend-next/src/ui/WorktreeChip.tsx
+++ b/desktop/frontend-next/src/ui/WorktreeChip.tsx
@@ -43,9 +43,14 @@ export function WorktreeChip({ sources, canCreate, selection, branch, busy, chan
   const isolated = workspace?.current === sources.sourceRoot && !!workspace.isolated;
   const chosen = sources.sources.find((source) => source.ref === selection?.ref);
   const label = chosen?.name ?? selection?.ref ?? branch;
+  const scope = useRef({ port, root: sources.sourceRoot });
   useEffect(() => {
     let live = true;
-    returnFocus.current = false; setWorkspace(null); setOpen(false); setQuery("");
+    if (scope.current.port !== port || scope.current.root !== sources.sourceRoot) {
+      scope.current = { port, root: sources.sourceRoot };
+      returnFocus.current = false; setOpen(false); setQuery("");
+    }
+    setWorkspace(null);
     void port.workspaces().then((value) => { if (live) setWorkspace(value); }).catch(() => {});
     return () => { live = false; };
   }, [port, sources.sourceRoot]);
diff --git a/desktop/frontend-next/src/ui/rewind-undo.interaction.test.tsx b/desktop/frontend-next/src/ui/rewind-undo.interaction.test.tsx
index 6d3afd88b4..f83c4ec67b 100644
--- a/desktop/frontend-next/src/ui/rewind-undo.interaction.test.tsx
+++ b/desktop/frontend-next/src/ui/rewind-undo.interaction.test.tsx
@@ -134,7 +134,9 @@ it("keeps undo after unrelated rerender, supports a refused undo retry and repea
 it("allows explicit dismissal without invoking undo", async () => {
   const h = await open(); await restore();
   await screen.findByRole("button", { name: "撤销这次回退" });
-  fireEvent.click(screen.getByRole("button", { name: "关闭回退提示" }));
+  const close = screen.getByRole<HTMLButtonElement>("button", { name: "关闭回退提示" });
+  await waitFor(() => expect(close.disabled).toBe(false));
+  fireEvent.click(close);
   expect(screen.queryByText("已还原 1 个文件")).toBeNull(); expect(h.undo).not.toHaveBeenCalled();
 });
 
diff --git a/desktop/frontend-next/src/ui/useWorkspaceBranches.test.tsx b/desktop/frontend-next/src/ui/useWorkspaceBranches.test.tsx
index cc219e2ac4..036fac8f79 100644
--- a/desktop/frontend-next/src/ui/useWorkspaceBranches.test.tsx
+++ b/desktop/frontend-next/src/ui/useWorkspaceBranches.test.tsx
@@ -22,3 +22,16 @@ it("releases the switch state on port change and ignores the old completion", as
   expect(switched).not.toHaveBeenCalled();
   expect(error).not.toHaveBeenCalled();
 });
+
+it("keeps the list a reader asked for when the root settles while it is being read", async () => {
+  const port = new MockPort();
+  let land!: () => void;
+  const branches = port.branches.bind(port);
+  vi.spyOn(port, "branches").mockImplementation(() => new Promise((done) => { land = () => done(branches()); }) as ReturnType<typeof branches>);
+  const { result, rerender } = renderHook(({ root }) => useWorkspaceBranches(port, vi.fn(), undefined, vi.fn(), root), { initialProps: { root: "/a" } });
+  act(() => result.current.loadBranches());
+  rerender({ root: "/b" });
+  await act(async () => { land(); await Promise.resolve(); });
+  expect(result.current.reading).toBe("ready");
+  expect(result.current.locals.map((b) => b.name)).toContain("studio");
+});
diff --git a/desktop/frontend-next/src/ui/useWorkspaceBranches.ts b/desktop/frontend-next/src/ui/useWorkspaceBranches.ts
index a20c329b83..87b13869cd 100644
--- a/desktop/frontend-next/src/ui/useWorkspaceBranches.ts
+++ b/desktop/frontend-next/src/ui/useWorkspaceBranches.ts
@@ -6,12 +6,16 @@ export function useWorkspaceBranches(port: AgentPort, onChanged: () => void, onS
   const [moving, setMoving] = useState<string | null>(null);
   const [reading, setReading] = useState<"idle" | "loading" | "ready" | "failed">("idle");
   const generation = useRef(0);
-  useEffect(() => { generation.current++; setLocals([]); setMoving(null); setReading("idle"); return () => { generation.current++; }; }, [port, root]);
+  const asked = useRef(false);
+  const load = useRef<() => void>(() => {});
+  useEffect(() => { generation.current++; setLocals([]); setMoving(null); setReading("idle"); if (asked.current) load.current(); return () => { generation.current++; }; }, [port, root]);
   const loadBranches = useCallback(() => {
     const current = generation.current;
+    asked.current = true;
     setReading("loading");
-    void port.branches().then((result) => { if (current === generation.current) { setLocals(result.branches); setReading("ready"); } }).catch((error) => { if (current === generation.current) { setReading("failed"); onError(error); } });
+    void port.branches().then((result) => { if (current === generation.current) { asked.current = false; setLocals(result.branches); setReading("ready"); } }).catch((error) => { if (current === generation.current) { asked.current = false; setReading("failed"); onError(error); } });
   }, [port, onError, root]);
+  load.current = loadBranches;
   const switchTo = (name: string) => {
     if (moving !== null) return;
     const current = generation.current;
diff --git a/release-notes/studio/unreleased/13674-branch-menu-stays-open.md b/release-notes/studio/unreleased/13674-branch-menu-stays-open.md
new file mode 100644
index 0000000000..d9e0753e00
--- /dev/null
+++ b/release-notes/studio/unreleased/13674-branch-menu-stays-open.md
@@ -0,0 +1,2 @@
+- 修复：刚进入窗格就打开分支菜单时，菜单会被自己的挂载收尾关掉，或一直停在加载中。关联 #13674。
+- Fixed: Opening the branch menu just as a pane settles no longer shuts it or leaves it loading forever. Refs #13674.