Android Beta Program

Dear ones,

I am not a developer but I am here because your (German) Support told me that they are not trained with Developer Options and cannot assist me further, so they suggested I should ask here.

I have a pair of Bluetooth headphones which support the LDAC codec.
I have been recommended to enable the developer options and set the playback quality of the LDAC codec to "optimized for audio quality".
But no matter how often I do it, every time I find this setting again in "Best Effort", which is suboptimal.

Can you please tell me why is this happening and how to avoid it?

Thanks!