This Bluetooth PBAP trick worked for me, but not as straight forward as I thought. I have a Samsung S21+ and Model Y. With PBAP 1.1 the car would not connect to the phone for calls. I had to make the PBAP 1.1 change, pair, then forget the phone on the car, change back to PBAP 1.2, then try to pair again without removing the old pairing on the phone. Kind of hit and miss until my contacts appeared on the car. Will see if they disappear again, but for sure the car is not able to talk to the phone for calls while on PBAP 1.1.