I've upgrade b4a and firebase to the newer version to continue to receive crashlytics from my application even after 15 november 2020.
I continue to receive crashlytics fine but without custom key. (Custom Key where set by a Crashlytics module that use fabric)
This is a wrapper of Firebase Crashlytics library for B4i. I made this for @Jack Cole and he gave me permission to post this in forum to help other users.