1.9 bug for levitation

Put the summary of the bug you're having here
1.9 bug for levitation
What I expected to happen was...:
Describe what you thought should happen here
I stop and stay under the leaves
What actually happened was...:
Describe what happened here
I went through some leaves and got stuck in some others
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...do /effect @p minecraft:levitation 999999
3. ...go under a tree