2 sticky pistons placed verticaly 1 at the botom and 1 at the top place cake in font of both extend both pistons then the top sticky piston's (where it extends)duplicates and the cake gets deleted!!!!!! wtf
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Confirmed with both sticky and normal pistons on all 4 directions.
Piston head duplication occurs randomly, but always on the top piston.
Cake gets deleted even with a single piston, maybe intended?

Seems to be intended: http://www.minecraftwiki.net/wiki/Cake: Cake vanishes when a piston extends into the block where the cake is.

Duplicate of MC-127.