Wierd getting stuck glitch/bug/whatever.

I built an endermen farm with an enderchest at my feet. However, I got stuck somehow. (See picture)

I was expecting to walk straight out like in the previous versions.

What happened however, I got stuck. I tried jumping and sneaking and everything, I just couldn't move.

Steps to Reproduce:
Just build similiar building like in the picture, and get in. You can no longer get out unless you break a block next to you.