[firebase_messaging]: FirebaseMessaging.instance.getInitialMessage() is always null on iOS after upgrade to 15.2.2

[lukyanov]

Is there an existing issue for this?

• I have searched the existing issues.

Which plugins are affected?

Messaging

Which platforms are affected?

iOS

Description

await FirebaseMessaging.instance.getInitialMessage() is always null when the app is opened from the "killed" state.

The plugin version 15.1.6 (the previous version I used) worked as expected.

iOS 18.3.1

@pragma('vm:entry-point')
Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  RemoteMessage? initialMessage = await FirebaseMessaging.instance.getInitialMessage()
  // initialMessage is always null here
}

void main() async {
  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
  ...
}

Reproducing the issue

1. Close the app (swipe it away)
2. Send a notification via firebase console or with a script (in my case I have a link attached to the notification data)
3. Tap the notification
4. Observe initialMessage being null

Firebase Core version

3.11.0

Flutter Version

3.27.2

Relevant Log Output

Flutter dependencies

No response

Additional context and comments

No response

[SelaseKay]

Hi @lukyanov, I've been able to reproduce this issue with the firebase_messaging example app. As a workaround, add a delay of 3 seconds before calling getInitialMessage and see if it resolves your issue.