This one is actually more serious compared to the other two I reported. I was building in survival and had mined a bed and some stone to replace the floor with wood. I placed the blocks in the hole where the items were floating, but instead of the items being "squeezed" (as I call it) up to rest on the new floor, they went down through multiple blocks to end up in my basement. I don't know what would've happened if there was no air at some point below them, but I think it would fall into a cave, or maybe even the Void. Pretty scary idea, so please fix this soon!