Bats Can Hang On An Invisible "Block" Below Minecraft

I spawned a bat in a 2x2 hole to the void and covered it with glass. The bat flew down the hole so I made a 1x1 hole to the void and jumped down it. When the bat came down, it went a few blocks away and didn't just hang on the bottom of the world, it hung a block under the world. I took a screenshot and force-crashed Minecraft just to get all of the details.