Bluetooth speaker muting when get a call, since pie / s10 upgrades

[Android Central Question]

I used s8 with oreo and bluetooth speaker. I simply put spotify on and set phone to vibrate only.
I'd get back to phone and see any notifications but the music wouldn't be interrupted.

Now I have s10+ and android pie.
Same speaker and method as above but the spotify music gets muted (doesn't ring through speaker just interrupts music).

Then when person cancels call or I do music resumes.

I've tried everything I can think of including turning off "calls" under the BT menu etc.

Driving me insane!