ShellRoute 실행 결과가 이상합니다 ..

선생님이랑 코드 똑같이 쓰고 라우트 위치도 맞는데 NestedScreen 가보면 이렇게 나옵니다.

아래는 더러울 수도 있지만 코드 전체 첨부합니다.

class NestedScreen extends StatelessWidget {
  final Widget child;

  NestedScreen({super.key, required this.child});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(GoRouterState.of(context).matchedLocation),
      ),
      body: child,
      bottomNavigationBar: BottomNavigationBar(
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            label: 'person',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.notifications),
            label: 'notifications',
          ),
        ],
      ),
    );
  }
}

// router.dart

 ShellRoute(
          builder: (context, state, child) {
            return NestedScreen(child: child);
          },
          routes: [
            GoRoute(
              path: 'nested/a',
              builder: (_, state) => NestedChildScreen(routeName: '/nested/a'),
            ),
            GoRoute(
              path: 'nested/b',
              builder: (_, state) => NestedChildScreen(routeName: '/nested/b'),
            ),
            GoRoute(
              path: 'nested/c',
              builder: (_, state) => NestedChildScreen(routeName: '/nested/c'),
            ),
          ],
        ),