I'm currently playing in 1.14.3 and I experienced this as well. I noticed only NOVICE villagers despawn, everybody who is either apprentice or above is fine, at least I haven't had any issues with despawning since I've leveled up all my villagers. I'm keeping track of baby villagers and after growing up + leveling up at least once they don't seem to despawn.
Jonathan Rothi
I'm currently playing in 1.14.3 and I experienced this as well. I noticed only NOVICE villagers despawn, everybody who is either apprentice or above is fine, at least I haven't had any issues with despawning since I've leveled up all my villagers. I'm keeping track of baby villagers and after growing up + leveling up at least once they don't seem to despawn.