I have weird issues with an open-source library that uses Bluetooth which I have not seen before. I am guessing it is the same issue. Does anyone know whether it should have been fixed in 12.1?

@Ayeshiz I had this problem initially when connecting to Lego with this library, which in its turn uses some common Bluetooth dependencies https://github.com/nathankellenicki/node-poweredup Not sure if it was both Apple and code base updates, but it has been working for me on 12.4 and 12.5 both M1 and Intel. hope this helps to further investigate your problem.