Boats on water have holes

Summary: With every boat outside bamboo boats, there are always holes if you position yourself in certain ways.
Steps to reproduce:
1. Place a boat/a boat with chest on the water
2. Position yourself on the front or the back of the boat
3. Watch the holes
Observed result: You see two holes, on the front and the back of the boat.
Intended result There should be no holes in the boat.