Crash app when receive a notification in background

When I subscribe to a topic and then the app goes to the background, when a new notification is received, the app crashes.
I am using Ionic 4 with Capacitor v2 and plugin version 1.1.2 (the latest for Capacitor 2) on Android 13.

see the log when the app crashes:

ERROR:
`**FATAL EXCEPTION: Firebase-CapacitorFirebaseMessagingService
Process: br.com.procergs.estudante, PID: 17542
java.lang.IllegalArgumentException: br.com.procergs.estudante: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.**
Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
at android.app.PendingIntent.checkFlags(PendingIntent.java:404)
at android.app.PendingIntent.getActivityAsUser(PendingIntent.java:487)
at android.app.PendingIntent.getActivity(PendingIntent.java:473)
at android.app.PendingIntent.getActivity(PendingIntent.java:437)
at com.google.firebase.messaging.zzb.zza(com.google.firebase:firebase-messaging@@20.1.2:62)
at com.google.firebase.messaging.zzd.zza(com.google.firebase:firebase-messaging@@20.1.2:33)
at com.google.firebase.messaging.FirebaseMessagingService.zzc(com.google.firebase:firebase-messaging@@20.1.2:70)
at com.google.firebase.messaging.zze.run(com.google.firebase:firebase-messaging@@20.1.2:2)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
at com.google.android.gms.common.util.concurrent.zza.run(Unknown Source:6)
at java.lang.Thread.run(Thread.java:1012)`

Could you guys fix it to work on Android 31 and above? Thanks!

Start by tracing the background notification path through FirebaseMessagingService and the Firebase Messaging dependency shown in the stack trace, version 20.1.2. Verify the Android 31+ PendingIntent requirement in the Capacitor FCM integration and reproduce with the reported setup. Done means a background topic notification no longer crashes on Android 31 and above.

Written by the indexing model from the issue text.