Player gets fall damage when bouncing over moving slime block

When the player bouncing over a moving slime block, sometimes the player will gets fall damage.

Steps to reproduce:

1. Download and import the attached worlds

2. If the piston isn't moving, press the acacia button, then move towards the moving slime block

3. Observe

Expected results:
Player does not gets fall damage.

Observed results:
Player gets fall damage overtime.