I have FCM backgroung message handling code in my Flutter(v 3.19.6) project as below:

 FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler1);

And top level function defined as below :

@pragma('vm:entry-point')
Future<void> _firebaseMessagingBackgroundHandler1(RemoteMessage message) async {
  //await handleRemoteMessage(message);
}

However I want to remove this function without uninstalling the app , When I try to comment both the above snippet, and just update the app (Not hot restart but flutter clean & flutter run) , I am getting runtime error

NoSuchMethodError: No top-level getter  _firebaseMessagingBackgroundHandler1 declared.

Is there any way to remove this vm entry without getting error.

I have checked to do this but not allowed by flutter

FirebaseMessaging.onBackgroundMessage(null);