Firebase data notifications are not recieved in production or on simulator

I get this weird error and i don't know how to solve it.
Can somebody push me in the right direction.

I'm using Firebase for push notifications on iOS and Android. This works just fine, it works in debug and in release.
But i want to send data messages aswell.

This works fine on android.
This works fine on iOS when connected to my mac but as soon as i build it for a release the data messages never get received.

I get this message when i run it in the simulator. I have no idea if this has anything to do with it.

[34070] <Warning> [Firebase/Messaging][I-FCM002019] FIRMessaging received data-message, but FIRMessagingDelegate's-messaging:didReceiveMessage: not implemented

Can somebody push me in the right direction on how to solve this?

in my AppDelegate i have the following overrides that should receive the data messages. They receive the data message when i debug. They dont receive it in the release version.

public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
public override void DidReceiveRemoteNotification(UIApplication application, NSDictionary userInfo, Action<UIBackgroundFetchResult> completionHandler)