So I recently finished a not-so-large (roughly 800 x 800 block) map in WorldPainter, a small island with mountains, plains, some forests with custom trees, tundras, and a large river branching off into a small lake. I had a few areas where I put snowfields (just a layer of snow over the ground), and I put trees on top of them, when I export the world and open it it, all the snowfields seem to be corrupted, where there was supposed to be a nice ground-level clearing with some nice pines (and a lake in the case of one), it tore a hole in the ground and now there is floating water and the trees I placed are nowhere to be found. The rest of the world is fine, does anyone know anything about this? I really need help! Pictures to be posted on my profile because PMC can't make it easy.
EDIT: Nvm I can't find a way to post the images, the snowfields look like giant holes (there is snow at the bottom) that fall about 3 blocks (sharply), there is floating water where I added a lake.