I imported a heightmap and created a landscape out of it. Gave it a lake and modeled a little lake overview area. My problem is this: every time after I save (ctrl+s or any other way), my landscape gets deformed and becomes blocky. What turns it back to normal is any kind of editing to the landscape like a simple click with any brush but then every time I try to save my changes the landscape just gets deformed again. I’m attaching screenshots of the before and after saving.
Before saving:
After saving:
