This kind of looks like bug 1866194, but you also appear to have the fix
for that installed. Regardless, please try:
cd ~/.config
rm -rf pulse
and then reboot.
** Changed in: gnome-control-center (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1901538
Title:
Output Device selection messed (Line Out <-> HDMI)
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