Redstone breaks when placed on piston.

You CAN place redstone dust on a piston. When powered the piston powers. However when the redstone is no longer powered, the piston retracts and the redstone drops. Now in 1.8.9 you cant even place redstone dust on a piston so I am not sure which is wrong: ability to place redstone on piston, or when you do so it breaks upon retraction.