Entering a Boat with chest on slime makes the boat fly up

When entering a stationary boat with chest sitting on slime blocks, the boat bounces into the air which it should not do.

Entering an already bouncing one amplifies this effect

 

How to reproduce:

1) Place a boat with chest on a slime block

2) Enter the boat

3) Observe

 

Expected behavior: Boat with chest would not bounce upon a player entering it

Observed behavior: Boat with chest bounces upon a player entering it