Boats move strangely when moving vertically while leashed (this allows the player to reduce fall damage)

Boats move strangely when moving vertically while leashed.

How to reproduce the bug:

1. Use the “/setblock ~ 100 ~ dirt” command
2. Use the "/tp ~ 102 ~" command
3. Jump and place a boat on the dirt block
4. Move the boat forward, and leash it