When loading back into a save ALL of the terrain paint disappears. PLEASE PLEASE PLEASE fix it, it's been happening for YEARS.
Edit By Crinrict: Adjusted Title fit bug report at AHQ
Ideas
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This is happening to me without leaving the lot or reloading the game. It seems to be getting triggered by switching to a second type of terrain paint, then pressing undo. If I undo with multiple types of terrain paint on the lot, it will just delete all of the terrain paint rather than undoing my last stroke.