Problem with calling in a car

I have a unique problem which has occurred first about 6 months ago. I have OP8T and Skoda Superb (2018). I've connected them via Bluetooth (full access) and I have a smart watch connected at all times to the phone as well.

Somehow when someone calls me the ring tone in the car works fine and when I answer, I can hear the caller on the car speakers, but when I make a call myself (on the cars system and actually using the phone) it will not connect to the cars audio system, but just to the phone. I have to change the source from the phone to revert it to car audio.

This is extremely frustrating, because I keep forgetting this (it worked fine before with the same exact setup.