Boats disappearing and sometimes with valuable stuff.

Ok, so what happened is that i spent a loong tome with getting one of the last two villagers (one is still at the village) to my base, and i got him near my base to trade with him for mending books, and i got out of the boat he AND the boat disappeared out of existence. This has happened 2-3 times before with just boats and this is just so annoying and i wanna breed them and the other village is a couple 200 blocks away. Pls fix this