Player jitters or bounces back when standing on a boat in water

Short description:
Standing or moving on top of the collision box of a boat floating in water causes the player to experience a "rebound" effect.

Steps to reproduce:

1. Place any type of boat into a body of water.

2. Dismount the boat or jump on top of it so you are standing on its collision box.

3. Attempt to move while standing on the boat.

Expected result:
The player should be able to stand and move on the boat's surface smoothly without being snapped back.

Actual result:
The player character repeatedly bounces back or stutters to their previous position.