I'm having a odd semi-related issue in that new Gmail notification are using the wrong sound. When I receive an email in the Gmail app, I get the Tri-tone (what I and most people use for text messages). In other words, the completely wrong sound is alerting me.
I go into the Gmail app settings / notification sounds (within the Gmail app itself) and it set to what it always was ..."Classic"...yet that sound doesn't play when I get an email.
I do not use the native "Mail" app and have it uninstalled on my computer. Feels like a bug but maybe I'm missing something. It's an iPhone 12 mini.