You are kicked out at the front of the bed when there are walls nearby, or on the top of the pillow part of the bed when there are no walls, as opposed to the side. This is frustrating, as my beds are usually in corners, as with most people. The major issue, however, is that you can easily suffocate or be kicked out of the bed through a wall off of a multi-story building. This is only prevalent in the Java snapshot version 19w12b version, possibly other newer snapshots too. I hope this issue gets fixed.