Issue

Boats in chests can be used to duplicate items.

Reproduction steps

1. Place a boat, and put a chest in it.
2. Enter the boat, and put items in chest.
3. Log out and back in.
4. Chest from boat + items have dropped on ground (and are picked up), and the boat loads in with the existing items and chest.

Logs

https://pastebin.com/z6wZWed0