Comment # 3 on bug 1228057 from Takashi Iwai

Judging from the log, it seems that the device provides two outputs and one
input.  This might confuse the default setup.

Actually, what does the secondary PCM (playback) device work for?  When you run
like:
  % aplay -Dplughw:2,0 -vv foo.wav
do you hear from the normal output from the headset?  And if you run like
  % aplay -Dplughw:2,1 -vv foo.wav
does it sound as well?

Also, can you record directly via
  % arecord -Dplughw:2,0 -fdat -vv bar.wav
?

You might need to turn off the wireplumber temporarily while testing the above:
  % systemctl --user stop wireplumber
and restart after testing
  % systemctl --user start wireplumber