Hi,
what is the purpose of the pve-dbus-vmstate@.service?
It starts a Perl script /usr/libexec/qemu-server/dbus-vmstate but not for every VM.
We have seen it running for a few VMs and sometimes it fails:
Aug 31 15:17:22 pve56 systemd[1]: Starting pve-dbus-vmstate@6000.service - PVE DBus...