I guess your bug is similar to this one: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1888598
Could you please do a test:
edit the /usr/share/pulseaudio/alsa-mixer/paths/hdmi-output-0.conf and hdmi-output-1.conf, change the priority in 0.conf to 58 and change the priority in 1.conf to 59, then reboot and redo the test.
I guess your bug is similar to this one: https:/ /bugs.launchpad .net/ubuntu/ +source/ pulseaudio/ +bug/1888598
Could you please do a test:
edit the /usr/share/ pulseaudio/ alsa-mixer/ paths/hdmi- output- 0.conf and hdmi-output-1.conf, change the priority in 0.conf to 58 and change the priority in 1.conf to 59, then reboot and redo the test.