I’ve had games in 0.5 and in the nightly build of 05/22 lose all data and landmarks on the map screen after saving, closing, and reloading. Unfortunately, I don’t have a know method for replicating the bug, nor does my logg.txt show anything noteworthy. Good luck finding and squishing this one.
This was a manual save and not autosave?
Yes, I don’t have autosave activated.