Terrain paint disappears after leaving lot

PC, no mods, no CC. Have had both all of the terrain paint applied disappear after closing game and re-opening, and yesterday, only one terrain paint stuck, Scratchy in Patches, like the last comment. There were at least 4 other terrain paints down. This does not seem to be an issue on every lot, as some of my builds have retained their terrain paint. 

I just had this happen and the sloped roofs with the smallest possible overhang (touches the walls) had their roof trim vanish and will not come back!  

Mac, no mods, no CC. Terrain disappeared completely after reopening my save file. It is a new blank save file with only on other Lot and one household. I knew this Bug exists but it is the first time it happened to me. Guess I was too optimistic about the recent fixes. 

Update on my report. I was spraying the Willow Creek park, got the whole thing done. I save (twice to be on the safe side) and quit for the night. Come back next morning, and half my work is gone. All the items I placed post-spray are still there.

PC, all packs, no CC, Windows 11 24H2.