So whenever I log out and login the next day, my villagers aren't there anymore, I don't know why but this is a very anoying thing that happens frequntly.

After an update (don't remember which one), I logged in to my world I every mob disappeared including my villlagers. I spent alot of time on those villagers and they were just gone like that. It also recently happened again and I have only 1 villager left.