Villagers lose beds while sleeping, babies born with one parent not knowing where their bed is.
Villagers forget the location of their home, sometimes while sleeping in it. Sometimes they then choose beds to which they cannot pathfind. I had 2 occasions of a baby being born to a pair while one of them had forgotten his bed location. There is a video offered to show this with documentation using a data pack showing the villagers memory in real time. Side note: the villagers were also using food as part of the "anger" mechanic while not finding their beds. A different bug?.
Here's a link to my 3 minute YouTube Video of this. https://youtu.be/6Gt8WcuBpKc