Current questions and answers regarding the map editor.

Good day. Please read the post to the end before asking questions. I apologize for repeatedly bringing up this topic, but I would like to discuss it. I recently started creating a map and decided to place two-sided monoliths in advance. When checking the map, a couple of errors related to the "ground floor" appeared, but the monoliths were standing on level ground, far from the water, and in the middle of the map. When I moved the monoliths a couple of tiles, the error disappeared. What could have caused this error? I also noticed that sometimes this error is a bug, as when saving the map once, the same error appeared, and yet there was absolutely nothing in the specified location – only level ground. When checking the map, this error did not repeat. I certainly don't place objects at the edge of the map, but it seems to me that the protection against errors in the game is too complicated. Please tell me how dangerous these errors are; visually, everything looks fine on the map (or rather, there's almost nothing there anyway).
P.S. I apologize for the number of times I used the word "error" in the post.
P.P.S. Ah, where are those times of the 3rd game... No problems on the map, and you could actually play it normally...