I found that when a oak leaf block and a jungle leaf block are touching each other, you can see through the map, just like an x ray.

Put the summary of the bug you're having here

What I expected to happen...: 

To see the leaves on the jungle leaf block.

What actually happened was...:
I could see straight through the ground.

Steps to Reproduce:
1. Place a jungle leaf block down.
2. Place an oak leaf block right beside it.
3. Look from the oak side, so that in front of you is the oak leaf.

4. You should see a void the color of the sky currently.