Put the summary of the bug you're having here

What I expected to happen was...:
The Slime in a classic superflat world would jump and land like normal.
What actually happened was...:
The slime slo-mo jumped. my game was not lagging as i was trading with a villager and i didnt have any problems.

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...