When a world is loaded into 14w29b, all piston_extension blocks have disappeared. Using /setblock ~ ~ ~ piston_extension will not output that piston_extension is not an existent block, but will not place the block either.
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I had been using piston extensions in the 1.8 snapshots and in 1.7 before this, though. It was only in 14w29 that they were removed from my world.
Piston extension cannot be used in the game, as it is a technical block, which was removed in 1.7