Problem with painting terrain

since the last update, I have a problem with painting the terrain, when, for example, I paint the grass with asphalt and save the level, the next time I enter the game my painting disappears and only the grass remains, as if I did not save the level at all. I will add that this only happens with the terrain, buildings and trees are saved as normal. how to fix it? is it just my problem or does everyone have it?