Upon testing, (this time I configured my app to exclude Firebase Remote Config and your .aia project file to have google-services.json with Firebase Database and Firebase Remote Config, exported as APK)
I successfully recreated the crash [Default FirebaseApp.initializeApp(Context)] to your .aia project file. Now, removing the Remote Config to your .aia file, the crash resolved but for my project, it still hasn’t been resolved, same runtime error though 
, only removing the extension resolves the problem in APK.
Oh well, I recently saw a post that a person also has that kind of runtime error but unfortunately, it didn’t get answered. Topic link: [New info]Firebase authentication , app crashes on impact - #11 by Mikolaj_Krajewski_Wario_S ← Seems like I have a similar case from this post.
I guess I’ll wait for the fix or any methods that could work on it.
Looking forward to it after April 6, I really wanted to add a push notification capability for my app.
Edit: Yep I fixed it and it was my unused Firebase Storage (I used your cloudinary extension instead because cloudinary was easier) 
I may have overlooked my components list, I thought it was another Firebase Database component, sorry about that but hey it works now!