I was driving for about 500 km during the weekend with AA.
AOD disabled,
Animated notification effect disabled
Fingerprint enabled
I had no issues. Only once my phone freezed during disconnecting from car.
On friday I have updated my phone to 20.1.9
Before my today's trip i have disabled AOD. Everything worked fine even with locked phone.
edit: One of the users on czech MIUI forum also confirmed that AA works fine with AOD turned off.
I think the problem is lockscreen related. Please can someone try to connect the phone to car with screen turned on and unlocked? AA worked fine during my evening ride.