Why Are My Firebase In-app Messages Unreliable In Production?

In-app messages work well in test mode, but seem to be very unreliable in production. I made campaigns with 'Modals' as the message layout. The simplest possible messages, without

Solution 1:

I got this to work now. I used this method instead to trigger the messages:

FirebaseInAppMessaging.getInstance().triggerEvent()

I also updated Gradle, so the latest version of com.google.firebase:firebase-inappmessaging-display was used.

So the solution to my problem was either using the triggerEvent-method or updating Gradle.