Duplication Bug

Duplication Bug

I expected the piston would push the block

It duplicated the Glowstone block i placed

Steps to Reproduce:
1. Place a piston with a stone block in front
2. Place a repeater where the stoneblock will come when its pushed
3. Place Redstone as a square from the repeater and back to it
4. In the square, place a repeater pointing on the piston so its powered
5. Now place redstone after where the stone block should be when its pushed
6. Place a stoneblock after the redstone and a redstonetorch on the back of it
7. Now it would act as a clock
8. Place a glowstoneblock (i used it) in front of the stoneblock and it will duplicate!