[ovirt-users] Snapshots don't seem to work with Windows VMs

I've been testing with Windows 10 1607 LTSB and created several snapshots. I can preview each one, but they all boot with the same configuration and software installed and files as the "active VM" - so I cannot see at all how to roll back changes. Is this a known issue? I believe I'm following the documentation properly, but I can't see that the snapshots are doing anything. I'm testing on Scientific Linux 7.4 using oVirt 4.2.2.6-1.el7.centos.