[MCPE-168925] Chest boats colliding with a hopper move upon reload

Repro steps:

Place 3 hoppers facing north
Place a hopper one block higher, facing north, but one block south of the other three
Place a chest boat on one of the lower hoppers
Hop in the boat and ride it so it is on top of all three hoppers
Sign out/In
Boat moves a little backwards

After reload, you can ride the boat forward again and if you log out again and log back in, it goes a little backwards again.

Once the boat has gone backwards enough that can't unload items into the first hopper, it stops moving:

Sample world file attached, you can ride the boat forward, log out/in and see the boat going a bit backwards from where it was left. It seems like a floating point or rounding issue.