If it’s to avoid clipping, then something is badly wrong in the older game, where the person walks inside a bunk bed, lies down, then sinks all the way through the bed before rising up to slightly levitate above it!

Although in that case the idea of a margin might make sense, since at the end they’re only barely above the bed. In the new game they’re in the right place at first, and then rise up like a foot and a half above the bed once the player approaches them…