Why does the LHDC automatically switch to the AAC when the POCO F7 Ultra is connected to the Bluetooth earphones and the earphones cover is on/off?

Thank you for your continued support. The POCO F7 Ultra has undergone strict professional inspection before leaving the factory, so you can feel free about the performance and reliability of your device, knowing that it has been thoroughly tested for quality and functionality.
This problem is caused by the active AAC codec setting after the earphone is reconnected. The phone side refers to the earphone settings, it is not a phone fault.