So a friend encountered the bug that a ladder would teleport him under the map. Upon further investigation we discovered that there is weird stuff under the map. We switched to first-person and walked at a wall, and so we could see through the map. We have seen a ladder a torch and door under map. We dug it up and discovered that it was completely black and we couldn't interact with it. I'll attach some screenshots. Please tell me what this is. My friends also sometimes encounter a bug that a ship would be completely black and everything on it would be gone, reconnecting solves the problem though.
