Disappearing villagers!

The game is great, but my villagers are disappearing, even exchanging with them, putting a nametag, in addition to many other spawn and despawn bugs, I'm giving these 3 stars because the game is really good, but just like in the version java, you could add other things, like: lie down with the trapdoor, put items in the 2nd hand, among others, thanks for making an effort in making this game, but you could fix it.