flutter push notification onclick function not work

I am developing a flutter app with push notification by firebase and i developing in my Iphone. The notification function is working, but i want to add a redirect function(redirect to special page(route name is "/map").

The function onDidReceiveNotificationResponse will be call when i click the notification message, but it will repeat calling the code inside onDidReceiveNotificationResponse but the redirect function is not work.

The log output

flutter: notification payload:
flutter: onDidReceiveNotificationResponse
flutter: notification payload:
flutter: onDidReceiveNotificationResponse
flutter: notification payload:
flutter: onDidReceiveNotificationResponse

class NotificationService {
  final notificationPlugin = FlutterLocalNotificationsPlugin();
  static final onNotifications = BehaviorSubject<String?>();
  bool _isInitialized = false;
  FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();

  Future<void> initNotification() async {
    print("NotificationService initNotification 1");
    if (_isInitialized) return;

    const initSettingsAndroid =
        AndroidInitializationSettings('@mipmap/ic_launcher');

    const initSettingsIOS = DarwinInitializationSettings(
      requestAlertPermission: true,
      requestBadgePermission: true,
      requestSoundPermission: true,
    );

    void onDidReceiveNotificationResponse(
        NotificationResponse notificationResponse) async {
      final String? payload = notificationResponse.payload;
      if (notificationResponse.payload != null) {
        debugPrint('notification payload: $payload');
        debugPrint('onDidReceiveNotificationResponse');
        AppGlobal.navigatorKey.currentState?.pushNamed('/map');
      }
    }

    const initSetting = InitializationSettings(
        android: initSettingsAndroid, iOS: initSettingsIOS);
    await flutterLocalNotificationsPlugin.initialize(initSetting,
        onDidReceiveNotificationResponse: (notificationResponse) =>
            onDidReceiveNotificationResponse(notificationResponse));
    _isInitialized = !_isInitialized;
  }