Put the summary of the bug you're having here

When I put a red stone on the piston, the red stone closed down, and the piston remained open until you destroyed the redstone.

(+)redstoneblock cannot closed 

What I hope to happen is...

Will be closed

What actually happened is...

The piston will not be closed, and it will be closed if you break the redstone

Steps to Reproduce:

1.setblock piston

2 please see "bug step2.png"

3.open level

4.setblock redstone(screen)

5.false powered level

6.The piston is not closed

There is no loophole in the portable version