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