To be honost, Im not sure if this is a glitch but I want to but this in here anyways.

I was derping around with pistons, and I found out that if you power a piston (with a lever or something) and put a redstone block ontop (the piston has to be vertical then remove the powersource the piston will still stay powered. I tried this with a piston facing sideways and it didn't work, witch led me to belive that this IS an error. Its kind of hard to discribe.

Basicly, if a piston is powered via a diffirent power source with a redstoneblock on top, then that powersource is removed it will still remain in the onn position.

The image that says "1" is when the powersource is powering the piston. Image "2" is when I remove that, and you see that it stays in the on possition.

In image "3" I place the power source, and in image "4" I remove it, but the piston retracts unlike image 2.