When powering a piston or sticky piston, it shows the piston head as a full block (on horizontal pistons it is smaller than a full block).
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is duplicated by 6
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Confirmed for 14w20a and b. As of 14w20a, piston head doesn't appear anymore as a full block but there are now two heads.
I've noticed that all pushable none solid blocks (tested with slabs, stairs, fences, gates and trapdoors) appear as full block when pushed by pistons