This bug relates to villager's ai and it's relation with the house structures. It may also happen with 1.14, 1.15 and regular 1.16 versions, otherwise how it would be in 20w49a?
Well, the bug is: My villagers died during an raid, so i "off camera" made them back in it. Then, it turned night, and my villagers were all trying to enter the same house and the same 2 beds. It was generating a BIG lag in my pc. Then, i "off camera" entered in Spectator mode, and saw tons of villagers inside the same freaking house. There was a house behind them, but no one wanted to be in it. BEHIND them. It also appears to affect Bedrock Edition, but it's kinda less buggy.