I have Parallels Desktop version 20.1.0 (55732). Running updates from within the app says I have the latest version of Parallels Desktop. I am having the same issue, I cannot revert to any snapshot of Mac VM 14.6. Reverting of snapshot works fine for both Windows and Linux VMs, only Mac VM has the problem. Unfortunately, that makes it useless for us as we cannot do any work without snapshot reverting of Mac VM. Kindly please fix this asap. Thank you!