diff --git a/apps/ai-game-creator-shell/src/App.tsx b/apps/ai-game-creator-shell/src/App.tsx
index 2abc16df0..e2a652ee9 100644
--- a/apps/ai-game-creator-shell/src/App.tsx
+++ b/apps/ai-game-creator-shell/src/App.tsx
@@ -12051,7 +12051,9 @@ export function App({
     }
     const invoke = resolveTauriInvoke();
     const directProjectPath = resolveChatProjectPath(localProject);
-    if (!invoke || !directProjectPath || !directTurnRunning) {
+    // 繁忙判据与「终止」按钮的可见条件一致：本地 invoke 正在跑，或订阅说还有一条回合没结束。
+    // 只认 `turn.started` 推导出来的 `directTurnRunning` 会漏掉"刚提交、事件还没到"的窗口。
+    if (!invoke || !directProjectPath || !supervisorChatBusy) {
       setProjectSupervisorRuntimeError('当前没有正在运行的回合，无法终止。');
       return;
     }
diff --git a/apps/ai-game-creator-shell/tests/appSurface/chat-composer.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/chat-composer.suite.ts
index 57bb32690..ccaae80aa 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/chat-composer.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/chat-composer.suite.ts
@@ -524,6 +524,43 @@ export function registerChatComposerControlTests() {
     expect(within(surface).getByText('已终止本次回合。')).not.toBeNull();
   });
 
+  it('terminates a turn that was submitted before its lifecycle event arrived', async () => {
+    // 刚提交、`turn.started` 还没下发：按钮已经变成「终止」，点击不能回"没有正在运行的回合"。
+    const pending: Array<{ resolve: (value: string) => void }> = [];
+    const { invoke, path, surface } = await openDirectCodexSurface({
+      chat_with_game_creator_direct_codex: () =>
+        new Promise<string>((resolve) => {
+          pending.push({ resolve });
+        }),
+      cancel_direct_codex_turn: async () => undefined,
+    });
+    const composer = within(surface).getByLabelText('陶泥儿对话内容');
+    await submitDirectTurn(surface, composer, '做一个小游戏');
+    await waitFor(() => {
+      expect(invoke).toHaveBeenCalledWith(
+        'chat_with_game_creator_direct_codex',
+        expect.objectContaining({ prompt: '做一个小游戏' }),
+      );
+    });
+
+    const stopButton = await within(surface).findByRole('button', {
+      name: '终止',
+    });
+    fireEvent.click(stopButton);
+    await waitFor(() => {
+      expect(invoke).toHaveBeenCalledWith('cancel_direct_codex_turn', {
+        projectPath: path,
+      });
+    });
+    expect(
+      within(surface).queryByText('当前没有正在运行的回合，无法终止。'),
+    ).toBeNull();
+
+    await act(async () => {
+      pending[0]?.resolve('回合回复');
+    });
+  });
+
   it('moves the reasoning effort control next to the model selector and persists only for later turns', async () => {
     let stored = 'high';
     const { invoke, surface } = await openDirectCodexSurface({