FirebaseMessaging.MessageReceived triggers multiple times on receiving single push notification

[REQUIRED] Please fill in the following fields:

• Unity editor version: 2020.3.43f1
• Firebase Unity SDK version: 11.0.0
• Source you installed the SDK: Unity Package Manager
• Problematic Firebase Component: Cloud Messaging
• Other Firebase Components in use: App (Core)
• Additional SDKs you are using: None
• Platform you are using the Unity editor on: iOS
• Platform you are targeting: iOS
• Scripting Runtime: IL2CPP

[REQUIRED] Please describe the issue here:

When triggering a push notification through POSTMAN having the following payload with the app in foreground, the FirebaseMessaging.MessageReceived event apparently fires 4 times.

The same is observed when app is in background and notification is tapped to resume the app.

{
    "data": {
        "typ": 13,
        "s_typ": 1,
        "cid": 1000,
        "pid": "payload_id"
    },
    "notification":
    {
      "title":"NotifTitleTest1",
      "body":"NotifBodyTest1"
    },
    "content_available": true,
    "mutable_content": true,
    "to": "czCPSW2Ar0Lwrf2D9CCz1w:APA91bFQg1Fgadw71fWx9WJo6WzfqFZ-81s8_Ff5_-dQwE7w9Fu2E96cciW49BMTU3vu4hJqFZDm5SuU_ettSKURRC0rdg7TTaHaIUO-vE_WKj_rfrI03ODklUz61TTiBmdrurBD-TTK"
}

I have double checked for multiple Monobehavior instances and subscriptions and all seems fine on this regard. I am even unsubscribing wherever I am subscribing to the events.

Attached screenshot where I am logging MessageID. Logs are printed multiple times with the same MessageID:

Steps to reproduce:

• Build for iOS
• Deploy to Xcode and build
• Use generated token to send notifications via POSTMAN while app is in foreground
• MessageReceived event triggers multiple times

Relevant Code: Attached main FCM helper script: RemoteNotificationReceiver.cs.zip

[Grimshady]

For now I’m using a workaround to run my code only on the first trigger

 private void OnFirebaseMessageReceived (object sender, MessageReceivedEventArgs inFirebaseArgs)
        {
            string messageID = inFirebaseArgs.Message.MessageId;
            if (!m_ReceivedPushIDs.Contains (messageID))
            {
                m_ReceivedPushIDs.Add (messageID);
                // Your logic here
            }
        }

[google-oss-bot]

Since there haven’t been any recent updates here, I am going to close this issue.

@Grimshady if you’re still experiencing this problem and want to continue the discussion just leave a comment here and we are happy to re-open this.