Comment # 4 on bug 1194214 from Tommaso Fonda

I think I am facing the same problem on my desktop PC. Xorg session with
pulseaudio; pipewire is installed, though.
When I plug my headphones into the desktop PC, if I try to adjust the volume
(by means of the dedicated keyboard key) immediately after plugging them in
(let's say, within one second), the Plasma session crashes and I'm brought back
to SDDM.
As a workaround, I have to wait 2 or 3 seconds after plugging headphones,
before I can increase or decrease the volume.
Next time I have the occasion to reproduce the issue I'll grab some logs.