Not sure if this is a plasma-pa bug or a pulseaudio bug. In plasma-pa -> Audio Volumue -> Advanced tab.... checking the "Automatically switch all running streams when a new output becomes available" causes PA to crash on startup. If the /etc/pulse/default.pa file is modified by commenting out following line: load-module module-switch-on-connect PA will start as expected. Auto switching works great even when the above line in default.pa line is commented out.
That's an issue in PulseAudio.
Do you know if there is some upstream bug report about this issue David?
I filed the bug here but received no response: https://bugs.launchpad.net/ubuntu/+source/plasma-pa/+bug/1716092. I can report elsewhere or re-file if needed.
Launchpad would be downstream, but the bug is upstream in PulseAudio. https://bugs.freedesktop.org/enter_bug.cgi?product=PulseAudio