What has changed with the push token (both device and firebase)?

Same implimentation which worked months ago no longer works. anything change?

I posted this bug here and think it could be linked to a recent change: Issues when duplicating apps

Also saw this one, unrelated topic but timing lines up with the issues: I am having a problem with the new build for android. The web preview doesn't look the same as the android apk after install - #2 by Surface_Level