@bielsnohr

Just checked on my OP6 with OTA-22:
I am able to connect to Bluetooth headphones (MusicMan BT-X42) and listen to music.
Make sure that in

/etc/bluetooth/main.conf

the last line says:

AutoEnable=true

About bluetoothctl, its sometimes a bitch, but you can try:

sudo bluetoothctl

then you get a inside the terminal something like:

[bluetooth]#

there you enter, always followed by an 'enter':

power on agent on default-agent scan on

wait a moment... until you see $yourheadphones device.
You first need to trust your headphones:

trust $yourheadphones

then when its trusted, you should be able to pair:

pair $yourheadphones

and finally connect:

connect $yourheadphones

Not sure if you have to turn scan off or not:

scan off

Hope that helped... I did not test this procedure on my phone, but on a rpi 😉