'fix'

app/api/vip/check-by-user/route.ts

@@ -20,6 +20,8 @@ type UserCheckPayload = {
   ok: boolean;
   vip: boolean;
   alreadyLinked: boolean;
+  /** 服务端异常/超时时为 true，前端勿据此清空本地已登录 VIP */
+  uncertain?: boolean;
   email?: string;
   linkedUserId?: string;
 };
@@ -292,18 +294,25 @@ export async function POST(request: NextRequest) {
       };
     } catch (error) {
       console.error("[check-by-user] failed:", error);
-      // 接口容错：即使 PB 回退失败，也不抛 500 给前端
-      return { ok: true, vip: false, alreadyLinked: false };
+      // 勿伪装成「确定非 VIP」，否则微信/H5 弱网会误清本地态
+      return {
+        ok: false,
+        vip: false,
+        alreadyLinked: false,
+        uncertain: true,
+      };
     }
   })();
 
   inflightUserRequests.set(userId, task);
   try {
     const payload = await task;
-    userCheckResultCache.set(userId, {
-      payload,
-      expiresAt: Date.now() + USER_CHECK_CACHE_TTL_MS,
-    });
+    if (!payload.uncertain) {
+      userCheckResultCache.set(userId, {
+        payload,
+        expiresAt: Date.now() + USER_CHECK_CACHE_TTL_MS,
+      });
+    }
     return NextResponse.json(payload);
   } finally {
     inflightUserRequests.delete(userId);

app/api/vip/check/route.ts

@@ -86,6 +86,10 @@ export async function GET(request: NextRequest) {
 
     return NextResponse.json({ ok: true, vip: false });
   } catch {
-    return NextResponse.json({ ok: true, vip: false });
+    return NextResponse.json({
+      ok: true,
+      vip: false,
+      uncertain: true,
+    });
   }
 }