When my bluetooth headset is connected, my phone will ring on incoming call, but the screen wont turn on and show notifications answer/reject buttons.
I can turn the screen on manually with power button and from there view incomming call info and answer/reject.
The phone is working as supposed to when NOT connected to bluetooth headset.
Even with original non bt-headset it is working fine.
This has been an issue for a couple of weeks and did not resolve with december update or oreo-beta.