Hi, I have no idea how to reproduce this, but if someone knows how to ‘provoke’ a notification I’ll try this and deliver a screenshot.
When Tor-browser shows me the notification that I can make it my standard-browser/-app there was the FF-logo instead of tor TB-logo in the notification-bar.
I use TB Alpha (beta test channel) from the playstore on my xiaomi mi 10t pro 5g with lineage OS 19.1 (Android 12).