The sculpting is remembered when reloading a save. When you start sculpting the loaded landscape, all earlier alterations reappear. Using the New option solves resets the sculpting.
Sculpt has been completely rewritten for the next update
https://imgur.com/a/qRZVdpK
https://imgur.com/a/OZlq8jt
https://imgur.com/a/2VSTzw5
Great, thanks.
