Minecraft wiki entry for Underwater_home, associated text: Before the Aquatic Update (version 1.13) in Java Edition it was possible to make air bubbles with fence posts, signs, glass panes, iron fencing, ladders and stairs as these blocks did not fill their volume completely, and would drive out water when placed. With the aquatic update only doors, fence gates, and banners still have these properties, and only in Java Edition. In other versions all the rest will become waterlogged when placed into a water source block.