Snapshot 13w10a, Snapshot 13w10b, Minecraft 1.5, Snapshot 13w11a
OS: Windows 8, 64-bit
Processor: Intel(R) Core(TM) i7-2770 CPU @ 3.40 GHz
Java Version: 7 Update 17
When a piston arm retracts with a block next to side of piston base, side of piston arm becomes shaded as if completely retracted.
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