Noifications "clogged"

They don't disappear after a long press BT3 (as I think is expected)

Which firmware version do you have? I know there was an issue with this recently but cutting edge firmwares have it fixed.

Since we are here, is there anything we can do regarding call notifications?

You mean they are not working?

Updated to latest code but I'm still not getting any notifications on a Bangle 2.

What happens if you connect with the IDE and paste this code in:

GB({"t":"notify","id":1575479849,"src":"Hangouts","title":"A Name","body":"message contents"})

If there are still issues it's probably best to discuss those in a new thread @HughB