Hey, I was inactive for a long time but now I gonna upload some redstone devices for you! ;p

I found something that seems to be a bug, I was messing around with piston timing and when I made a double piston extender that retracts instantly I placed a block under the sticky piston, the sticky pistons pushed the block down but did not move it up. I expected it to move the block 1 up but it just didn't. I think it happens because when the bottom piston is unpowered but still didn't pull the block in front of it it already counts retracted and then it can be moved, so the extended-piston block realizes that there is no piston block next to it and disappears.

This is not really a project, it's more something I want to show you in case someone find it useful.