It's been some months now. Any update on this in the upstream project? btw, I tried searching for issues with Orangepi HDMI audio but not much came up so I think we're relying on your secret sources 
As I have pointed out, its an issue with the OS. Theres loads of people with no sound on certain TV's / Monitors.
As its an OS thing, it effects any hardware of this type. Its on the Orange Pi forums and Raspberry pi forums alike.
There is no issue with older bullseye, but bookworm as its classed as still fairly new.
We are having to look at ways to try and resolve this ourselves. I'm sure dev will post here if I have missed anything.