In A Plains village, I laid down many beds for villagers. I also fed some villagers bread to breed. After they bred, and the babies grew up, there were two villagers without jobs. Every villager was sleeping, except for the two without jobs. There were also empty beds. As soon as it turned day, the villagers without jobs went to bed in the day, turned black, And very quickly slid across the line of beds and disappeared. One went into the wall and the other disappeared at the end of the line of beds. I was unable to recreate this, and I would provide a video if I could. Some of the conditions were, Three block ceilings, Two lines of beds, One bell, And two lines of every type of workstation. I don't know if you need this, But the seed that this happened on is -1043146628. I have no other information about this bug. I also believe this happened on 1.16.100, but I am not sure.