Bluetooth not connected while in Apple CarPlay?

Hi everybody, last wednesday my new Seal U Dm-i finally arrived. I’m still “studying” it and I must say I’m really impressed. I noticed a weird thing though: when I launch Apple CarPlay the Bluetooth pairing is apparently off. CarPlay works fine, but if I open the bluetooth menu of the car my phone seems to be disconnetcted. Is this normal? Am I supposed to do something? Thanks a lot!