Hi, when I connect my bluetooth earphones, there is no sound. The only way to "fix" that is changing the bluetooth codec in developer options to another one and changing again to the previous one. This bug happens in the last weekly.
I have the same problem. Xiaomi Mi Max 3 (MIUI 12) and Sony WH-1000XM4. But my "fix" is not using developer options. I just go to bluetooth options for headphones, the switch off and switch on "LDAC Codec" slider. I also looking for solution