I've been seeing some complaints that when you find a village, players do everything to protect their villagers, but over time the villagers despawn (even doing trades and with advanced levels) continuously until there are 2 or no villagers left in the village. This occurs when logging in and out of the game or simply during the user's gameplay.

PS: I also see complaints about this happening with the Axolot after some players make an aquarium and put the Axolot inside it.

Suggestion: I think it's interesting to see if this is not happening with other mobs to avoid the player's disappointment (I know it's normal for some mobs to despawn if they have no renamed but in some specific cases it would be possible to remain the mobs like cows, chicken or pig that the player gave food to mate or rare mobs like renamed fish inside the buckets).