Update user modified configuration files with the the appropriate monitor.enabled=true:
IE… alsa_monitor.enabled=true would need to be added to the top of 50-alsa-config.lua
or
copy the updated files from /usr/share/wireplumber and re-make your changes.
If this was just about a custom wireplumber configuration, I’d say this doesn’t belong to #common-issues , because it’s not common. But another person in bugzilla mentioned the same happened on a system without any config modifications, so let’s see if the bug turns out to be something different.