I ran into this exact same issue on my issue. I don’t know if you are experiencing the same problem because it ended up being that timidity-daemon was causing this to appear. I ended up having to remove that and it started working.
The one thing I can suggest as a workaround is running this command
sudo alsa force-reload
This would force my device to start working again.
source https://askubuntu.com/questions/1242766/ubuntu-20-04-dummy-output-no-sound-card-in-use