Sorry, I tried to figure out how to post these potential bugs on Discord but its too confusing for me. Feel free to delete my posts as needed if they are cluttering up things.

On the big island in the NW corner of the map, the outside terrain above the giant cave system cant be built upon either. I assume its because the ceiling of the cave is too close to the area since in some spots, the blue crystals in the caves ceiling have light shining up thru the ground.

Dont know if this is a bug or now, but outside the blue and orange crystal cave in the desert are a ton of bats (upper left corner of H8). Are they supposed to be inside the caves or did you intend for them to be bunched up at the very end of the cliff/cave area?