I have had a villager breeder in my world for some while. In 1.16.2 there was a update to beds and the areas where you can spawn and over certain blocks. The bug I noticed was with in my villager breeder. I have the 2 villagers on a fence post with beds around it and trapdoors keeping them in place to breed. When the villagers woke up on the first day on opening 1.16.2 noticed that they were not in there 1x1 area on top of the fence post. Instead they were out on the bed. This wasn't a problem in 1.16.1. Its just that there is a open place for them to go to but they seem to prefer to go on the beds.