Bluetooth connect in Zwift off after installing BigSur 11.0.1

Hello, it seems BigSur download stops Zwift to actively running Bluetooth. Due to no connection with my smart machine (Elite) I am fussed what a solution could be. I contacted Apple, they ran several tests, nothing irregular. After installing 11.0.1 I do not know how, what happens when installing old/previous Big Sur version on Laptop. How can I solve this best?