I wanted to compile this list of blocks that are buggy. This can be useful to submit to Chortlesharks for fixing. -THE LIST- The heavy pipe collection, the outpost and test pipes, when placed on a background, do not count as actual blocks and let light through. Recommend not using if you are making some sort of background involving the pipes. They do, however, function as a foreground wall. The sewer pipe collection. Some are of them are just generally borked, one will crash your game if you even have it in hand. The most notable one that depressed me was the pipe middle block, I really enjoyed using them, but now when you place it transforms into a beautiful mirror block. I do believe one of them functions, but it's not recommended to use it.