Allay, chestboat, mud java.lang.NullPointerException: Cannot invoke "dnm.a()" because "$$1" is null

HOW TO REPRODUCE:

(look at the image, then place the allay under the chestboat, MUD FLOOR is necessarily) - by saying place the allay, i mean use the spawn egg

What did i expected: Allay will sit in the chestboat.

What actually happened: Game crashed.

FOUND OUT THIS ALSO MAY HAPPEN WITHOUT THE CHESTBOAT, BUT ONLY WITH MOVING WATER (i guess, i dont think i will do another tests, if you want, you can test another reasons of crash and send them into the comments)