Put the summary of the bug you're having here

What I expected to happen was...:
I Thought Nothing Would Happen

What actually happened was...:
It Somehow Worked

Steps to Reproduce:
1. Place A Piston Facing Somewhere
2. Have A 1 Block Space Above The Piston
3. On The 2nd Block Above The Piston Have A Redstone Block
4. It Powers The Piston

Diagram
[Redstone Block Here]
[ 1 Block Space Here ]
[ Piston Here ]