F3+B Hitbox not rendering in front of block 36

The bug

While extending, Block 36 will render in front of the white/blue/red lines that make up the box that visualizes an Entity's hitbox while in F3 + B mode.

How to reproduce

1. Set up this: http://i.imgur.com/bWPPSaa.png
2. Place a button: http://i.imgur.com/QCPgk1v.png
3. Press the button, and quickly take a screenshot: http://i.imgur.com/Q3Xk6jm.png

You can see it a bit clearer if you zoom in: http://i.imgur.com/eICj8z4.png