Not being the original poster, but I can nevertheless add that there are clearly issues with certain Bluetooth (and Bluetooth BLE) devices in Android 12. For the Bluetooth audio issue other users have already reported a workaround by disabling AD2P in the Developers settings (something I still consider a kludge).
I have however a serious issue with my Polar H7 sport band, which I also use for monitoring my hearth frequency. This is a Bluetooth LE device which worked flawlessly on my A72 with Android 11, both with the official Polar Beat app as well as with other generic BLE sport band enabled apps.
Unfortunately, the band stopped working as soon as my A72 was updated to Android 12. The device shows up as a neighbor BLE device, but unfortunately trying to connect it to ANY compatible app (including the official one from Polar) fails. I can't use it any more, which is really a shame as the band helps me in monitoring my hearth.
To be extra-sure that the band didn't stop working coincidentally, I tried to pair it on my wife's A52 5G, which thankfully is still running Android 11, and as expected there it works like a champ with all the apps.
I'd be glad if Samsung would provide a fix as soon as possible. Thanks.
