Foreground Messages not received via onMessage if userNotificationCenter:willPresentNotification:withCompletionHandler: implemented

[mahmutpinarbasi]

Hi,
We read following document https://firebase.google.com/docs/cloud-messaging/flutter/receive for receiving foreground messages on flutter, however we need your help to understand relationship between onMessage and implementing userNotificationCenter:willPresentNotification:withCompletionHandler: delegate function.

Right now, if we implement userNotificationCenter:willPresentNotification:withCompletionHandler: delegate, onMessage is not being called at all -on iOS-. However onMessage is being called if we don't implement userNotificationCenter:willPresentNotification:withCompletionHandler:.

So the question is;
a) is this expected behaviour. Means; If we implement userNotificationCenter:willPresentNotification:withCompletionHandler:; we took over the responsibility to manage foreground messages. -if that's the case, updating the documentation can be very helpful-
b) this behaviour is not expected, this is something we should analyse on our app.
c) is this a bug