I’m using perforce, but it’s happened before I started using source control and after. Let me ask you this… Are you on a desktop or laptop? Do you have auto save enabled? How long was the project open the time before you noticed the reset? Are the classes that were reset spawned into the level or already placed?
Hoping to help narrow down a set of similar criteria so unreal staff can find this bug. Because unreal staff can’t reproduce the issue my guess is it has to do with having a project open for an extended period of time.