Bukkit

What steps will reproduce the problem?
1.Attempt to create push/pull stack, with non-piston items on the top.
2.Power push/pull stack.
3.Remove power.

What is the expected output? What do you see instead?
I expect the entire 6 block stack that is on top of the sticky piston to retract one square.  Instead, only the first block retracts.  Interestingly enough, other pistons retract as expected, including multiple pistons.

What version of the product are you using?
0.2b

Do you have an error log of what happened?
There was no generated error.

Please provide any additional information below.