macbook bluetooth audio connected but silent since upgradig to Ventura

Hi,

since I upgraded to Ventura there is no sound coming out my external bluetooth speaker BOSE Soundlink despite it is connected. On the contrary sound comes out from internal speakers.

I already checked everythig:

• it works on other devices
• it is connected to bluetooth.
• in sound options it is rightly selected as output device
• everything else is working.
• I tested a bluetooth buds and they work

What else?