Yep so version 6.0 of QEMU is most likely the problem.
That version of QEMU has several bugs that upstream are aware of and working on a fix for them. Once they are merged and backported to the 6.0 branch then the packager of your distro can update its version.
We are going to continue testing on QEMU 6.0 and raising issues as we find them. For users of the snap package it may be that we can manually backport some of the fixes too.
Does it still hold true guys? My virtual machines stopped working. I have noticed I have QEMU version 7.1.0, so I’m suspecting system update created problems. But interestingly I can spawn new virtual machines, only the old ones stopped working.