Put the summary of the bug you're having here
What I expected to happen was...:
piston shudn't extended
What actually happened was...:
piston extended
Steps to Reproduce:
1. put piston looking up
2. put 2 redstone blocks on top
3. break bottom redstone block
Environment
Put your operating system (Windows 7, Windows XP, OSX) and Java version if you know it here
Linked issues
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