Comment 14 for bug 1821696

^ This is a completely different issue to the VolumeEncryptionNotSupported exception from the initial description that leaves the instance in an ERROR state.

IMHO this should live in a separate bug as it suggests that your instance is attempting to boot from a non-bootable volume over the bootable image for some reason.

It would be useful to have output from the following commands to review to determine what's going on here:

$ virsh domblklist ${instance-uuid}
$ virsh dumpxml ${instance-uuid}