Using 5.1 and today after a few rather tiny edits and placement of a newly created character and lights the editor became very slow. A decision was made to restart. Saving took very long, about one hour, a long time the save was busy with “Cleaning up old data”. Prior to this there were a lot of Fixing Redirectors made and some actors moved.
After the save completed and restart the map is missing what appears to be all the content including landscapes which was previously untouched.
Actors disappearing after saving Unreal Engine Issues and Bug Tracker (UE-169292)
The linked bug tracker entry may be related and the fix from today may indeed resolve the issue. Until 5.2 is released I install now the main branch…
Update
I have also renamed the WP map, and did not run fix redirectors on it. The strange thing is I’ve done this a few days earlier and the map was fine until more edits were committed.
The data here was corrupted somehow is located in
- ExternalActors
- ExternalObjects