World Editor issue V0.21.4

Anyone know how to fix the bug when i save map twice after i make Terrain paint or Height the whole terrain block disappears then it doesnt save my changes

 

Terrain saving doesn't work anymore in the old editor (unless you swap into v0.19). You can still shape and paint the terrain in the old, then hop to the new editor and do the saving there.

Edit. some terrain editing must be done also in the new editor before saving, then it works

 

Ive tried the back and forth save thing before. never worked