Sprinting and breaking particles of piston arms use same particles as piston eventhough there no stone on the arms

Description:When you are sprinting on the heads of extended pistons are creating particles of the regular pistons. I discovered it in early 1.4.6 and it was still in the bugfixing releases, and so I reported the issue.
NOTE: It only has the wrong particles when pistons are sideways, not when facing upwards...
Not related to the bug: I just wanted to say for the mojang team that the game is awesome and I like it, and I would like to see more mechanisms and things that make more sense, like anvils not falling through flying objects such as bats, or like when in pvp the crits are increasing by every third blocks where the attacker has jumped off. 🙂