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Bug
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Resolution: Duplicate
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None
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Minecraft 1.9.1 Pre-Release 3
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None
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Operating system: OSX 10.9.5
Java Version: 1.6.0_65
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Unconfirmed
When a piston is retracting, the body of the piston becomes intangible for a moment. This means that the player can be pulled through it by the piston head. It also means that blocks that need to be attached to a block (like torches or redstone) placed on top of the piston will pop off when the piston retracts.
This video by Sethbling provides some more detail: https://www.youtube.com/watch?v=0b7A4m2SFSQ