Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here send a link for me too update my minecraft so it gets fixed

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...get the snapshot 15w ... and runnit on ure regular minecraft
3. ...seed 61238 and look at the outline of grass and other blocks my mc looks like this picture added.