This has been occurring even after the last two updates. Once dusk hits, villagers normally go to sleep in their linked bed. Just before update 1.16.220 my villagers and members in my world have seen villagers not go to their specific bed but rather sleep in the doorway haha. It's still occurring in this latest update as well. Happens at least once every full day cycle with 1 - 3 villagers. I can wake them then they proceed to sleep in their bed correctly but that's the only way. If not bothered the villager will sleep in the doorway the entire night cycle.