What I expected to happen was:
The Piston would be not extended after the button press
What actually happened was:
The piston stayed extended after the button press with no signal around
Steps to Reproduce:
1. Place A Sticky Piston 5 Blocks Above The Ground facing downwards with a redstone block on its face.
2. Place another sticky piston below the redstone block.
Environment
Put your operating system (Windows 7, Windows XP, OSX) and Java version if you know it here
Duplicate of MC-108, which Works as Intended