Notification showed twice

[robman70]

Hello,
I implemented FCM notifications in my app following the example here: https://pub.dev/packages/firebase_messaging/example (with very little modification).

The notifications arrive and are displayed but I have a strange behavior... in some cases the notifications are displayed twice, it almost seems that one is the 'system' one and one the one generated by Flutter and touching, one of the two (with l 'other doesn't happen), Flutter throws a 'FlutterError (Navigator operations requested with a context that does not include a navigator)' error.

In detail:

• if I set the default channel in the AndroidManifest.xml, the notifications are always double
• if I don't set the default channel in the AndroidManifest.xml, the notifications are double only when the app is in the background

I'm going crazy, I don't understand where is the problem... :-(