a piston unpowered from the block above by a long wire wont update

if you make a redstone wire on top of a line of blocks at least 12 blocks long and put a piston at one end and then power and unpower the other end, the piston extends when powered, but doesn't retract when unpowered.

to replicate:
build what is shown in 2015-04-07_22.46.10.png and turn the lever on and off