Can the install be configured so comment out a line in /etc/pulse/default.pa?
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" cause PA to crash. If the /etc/pulse/default.pa file is modified by commenting out following line:
PA will start as expected. I have not checked to see if the auto switching works when the default.pa line is commented out.
Bug reported here: https://bugs.launchpad.net/ubuntu/+source/plasma-pa/+bug/1716092
and here: https://bugs.kde.org/show_bug.cgi?id=384997