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By "not working", you mean audio fails to initialize, or there's just no output? What's listed in snd_listdrivers, and is the Bluetooth device you're expecting to be used listed there? That snd_status output indicates audio was initialized, though you'll need to look at the initialization output or snd_listdrivers to tell which device is being used (snd_listdrivers will have an asterisk next to the device that's currently opened; I should probably update OpenALSoundRenderer::PrintStatus to show the full device name like it uses to show the device at initialization and match the name in snd_listdrivers).

Here is the output of snd_status:

I'm using Doomrunner with Gzdoom 1.10
On latest Arch Linux 21.05.2023, from a Laptop with build-in bluetooth adapter.

Without any mods, just using Doom2.wad, the audio from my Bluetooth Speakers sometimes works, sometimes not.
Most of the time it does'nt work. Reconnecting the Speakers does not help. I disabled all the other audio outputs, not the speakers.
To make matters more complicated, my Bluetooth Speakers are for whatever reason detected as Bluetooth Headsets by my OS.
Btw. this does NOT give any problems with other audio-capable programs, like Firefox or Chrome.

In my opinion it might be a problem with gzdoom.
Maybe the speakers don't get detected correctly?