The algorithm that places players and villagers back into the world after getting out of bed no longer accepts soul sand, mud, farmland, dirt path, or eight layers of snow as a valid place for the player to end up.

If you put a bed under a 2-high ceiling and surround it with soul sand or farmland, when the player gets out they will end up on top of the bed in the flying/crawling state. When the villager gets out of the bed in similar circumstances they will end up on top of the bed suffocating on the ceiling (shown in the pictures).