diff --git a/apps/mobile-shell/scripts/check-config.mjs b/apps/mobile-shell/scripts/check-config.mjs
index ff7e89476..482ba4c92 100644
--- a/apps/mobile-shell/scripts/check-config.mjs
+++ b/apps/mobile-shell/scripts/check-config.mjs
@@ -1520,12 +1520,20 @@ for (const snippet of [
   'genarrative.mobile.historyState',
   '__genarrativeMobileHistoryIndex',
   '__GENARRATIVE_MOBILE_POST_NAVIGATION_STATE__',
+  "console.warn('mobile navigation state sync failed', error)",
 ]) {
   if (!webViewPolicySource.includes(snippet)) {
     throw new Error(`mobile shell WebView policy missing ${snippet}`);
   }
 }
 
+if (
+  webViewPolicySource.includes('catch (error) {}') ||
+  webViewPolicySource.includes('catch (_error) {}')
+) {
+  throw new Error('mobile shell WebView policy must not hide injected script failures');
+}
+
 if (
   webViewPolicySource.includes("['blob:'") ||
   webViewPolicySource.includes("'filesystem:'")
diff --git a/apps/mobile-shell/src/shell/webViewPolicy.test.ts b/apps/mobile-shell/src/shell/webViewPolicy.test.ts
index d21f9148a..0f0af8169 100644
--- a/apps/mobile-shell/src/shell/webViewPolicy.test.ts
+++ b/apps/mobile-shell/src/shell/webViewPolicy.test.ts
@@ -169,6 +169,32 @@ describe('TRACK_MOBILE_WEBVIEW_HISTORY_SCRIPT', () => {
     );
   });
 
+  test('路由栈状态写入失败时记录日志', () => {
+    const postMessage = vi.fn();
+    const syncError = new Error('history state blocked');
+    const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => undefined);
+    window.ReactNativeWebView = {
+      postMessage,
+    };
+    window.history.replaceState = vi.fn(() => {
+      throw syncError;
+    }) as typeof window.history.replaceState;
+
+    window.eval(TRACK_MOBILE_WEBVIEW_HISTORY_SCRIPT);
+
+    expect(warnSpy).toHaveBeenCalledWith(
+      'mobile navigation state sync failed',
+      syncError,
+    );
+    expect(postMessage).toHaveBeenCalledWith(
+      JSON.stringify({
+        type: 'genarrative.mobile.historyState',
+        canGoBack: false,
+      }),
+    );
+    warnSpy.mockRestore();
+  });
+
   test('重复注入时回放当前 H5 路由栈状态', () => {
     const postMessage = vi.fn();
     window.ReactNativeWebView = {
diff --git a/apps/mobile-shell/src/shell/webViewPolicy.ts b/apps/mobile-shell/src/shell/webViewPolicy.ts
index a6fe58003..215d73396 100644
--- a/apps/mobile-shell/src/shell/webViewPolicy.ts
+++ b/apps/mobile-shell/src/shell/webViewPolicy.ts
@@ -176,7 +176,9 @@ export const TRACK_MOBILE_WEBVIEW_HISTORY_SCRIPT = `
         '',
         window.location.href
       );
-    } catch (error) {}
+    } catch (error) {
+      console.warn('mobile navigation state sync failed', error);
+    }
   }
 
   window.history.pushState = function(state, title, url) {
diff --git a/docs/project-memory/shared-memory/decision-log.md b/docs/project-memory/shared-memory/decision-log.md
index cf303baae..04068afa5 100644
--- a/docs/project-memory/shared-memory/decision-log.md
+++ b/docs/project-memory/shared-memory/decision-log.md
@@ -2958,6 +2958,13 @@
 - 影响范围：`apps/mobile-shell/src/shell/ShellApp.tsx`、`apps/mobile-shell/src/shell/ShellApp.test.tsx`、`apps/mobile-shell/scripts/check-config.mjs`。
 - 验证方式：`npm run mobile-shell:test -- src/shell/ShellApp.test.tsx`、`npm run mobile-shell:typecheck`、`npm run check:native-shells`、`npm run check:encoding`、`git diff --check`。
 
+## 2026-06-20 移动壳返回栈状态同步失败不可静默
+
+- 背景：Expo 移动壳通过 WebView 注入脚本追踪当前 H5 文档 history index 并回传 `navigation.canGoBack`；如果 `replaceState(...)` 写入 index 失败后静默吞掉，Android 返回键和 H5 返回按钮状态可能漂移且难以排查。
+- 决策：`TRACK_MOBILE_WEBVIEW_HISTORY_SCRIPT` 的 `replaceCurrentState()` catch 路径必须输出 `mobile navigation state sync failed` 浏览器 console 警告，同时继续回传当前可返回状态；移动壳配置检查拒绝该注入脚本重新出现空 catch。
+- 影响范围：`apps/mobile-shell/src/shell/webViewPolicy.ts`、`apps/mobile-shell/src/shell/webViewPolicy.test.ts`、`apps/mobile-shell/scripts/check-config.mjs`。
+- 验证方式：`npm run mobile-shell:test -- src/shell/webViewPolicy.test.ts`、`npm run mobile-shell:typecheck`、`npm run check:native-shells`、`npm run check:encoding`、`git diff --check`。
+
 ## 2026-06-20 移动壳生命周期映射门禁
 
 - 背景：Expo `AppState` 的 `active`、`background`、`inactive` 以及未知状态都会进入 `app.lifecycle` 事件；如果归一化映射漂移，H5 游戏循环、背景音乐和固定玩法音频会错误恢复或暂停。