[Local Notifications][Firebase] Opening app from notification does not show data on iOS devices #377

Please fill in the following fields:

Unity editor version: 2019.2.17f1
Firebase Unity SDK version: 6.7.0
Source you installed the SDK (.unitypackage or Unity Package Manager): .unitypackage
Firebase plugins in use (Auth, Database, etc.): Messaging
Additional SDKs you are using (Facebook, AdMob, etc.): Facebook , Mobile Notifications(Package manager), Play Games
Platform you are using the Unity editor on (Mac, Windows, or Linux): Mac/Windows
Platform you are targeting (iOS, Android, and/or desktop): iOS/Android
Scripting Runtime (Mono, and/or IL2CPP):IL2CPP

Please describe the issue here:

Unity local notification plugin does not work in some cases when firebase plugin is added.

Test case 1:

1. Install Mobile Notifications
2. Run some notifications
3. Close app
4. Open app from notification
   5.1) receive callback about opening app from notification on Android [WORKS]
   5.2) receive callback about opening app from notification on iOS [WORKS]

Test case 2:

1. Install Mobile Notifications
2. Install Firebase
3. Run some notifications
4. Close app
5. Open app from notification

6.1) receive callback about opening app from notification on Android [WORKS]
6.2) receive callback about opening app from notification on iOS [DOES NOT WORK]

(Mobile Notifications)Android :
iOSNotificationCenter.GetLastRespondedNotification();

(Mobile Notifications)iOS :
AndroidNotificationCenter.GetLastNotificationIntent();

Please answer the following, if applicable:

Have you been able to reproduce this issue with just the Firebase Unity quickstarts (this GitHub project)?

plugins works great without each other

What's the issue repro rate? (eg 100%, 1/5 etc)

100%