Hello,
I've noticed that if I have do not disturb mode enabled, with the following options ->
Backlight -> Don't Change
Smart Notifications -> Off
Alerts -> Don't change
Wrist Gesture -> Don't change
I still get the notifications from the phone, but they do not vibrate (they only display on the screen). I see the same thing in sleep mode (which enables do not disturb mode). It's also very consistent (i.e. it's not an on and off again issue).
I'm on the latest 10.43 software version.
I'm happy to share more details or try changes to the settings.
The phone in question is an older Samsung S7 running android 8. This is on a fenix 7s solar sapphire.