So today I needed to power down the electricity to do some work. I turned the power back on and when I went into HA and I was surprised to be greeted with a notification the the Bluetooth adapter was found and whether I wanted to configure it. Had to double check that the container didn’t have the privileged flag set.
I think this is down to me running commands on the host and the Bluetooth adapter then being locked to that host so wasn’t accessible to the container. I suspect I probably just needed to do something to release the adapter (I did think I had restarted all the bluetooth stuff) but if anyone else comes across this and has ran out of things to try then restarting to clear everything out might solve it…