Pistons aren't unpowered if they are powered diagonally. It seems to me that they can not be powered diagonally, but when they are updated, they mistakenly think they are powered and thus don't retract. See screenshot #1. I achieved that by flipping the lever on the left and then pressing the button on the right.
Further proof for this behavior is screenshot #2: I achieved that by pressing the button on the left, then immediately pressing the button on the right. What (I think) happens is:
1) The piston is powered and extends.
2) The block diagonally next to the piston is powered.
3) The piston is unpowered, but it believes it's still powered by the block diagonally above it and thus doesn't retract.
4) The redstone on that block turns off, but doesn't update the piston, which is why it stays extended without any redstone current at all.
What did I expect to happen? Well, I expected the piston to completely ignore anything that's not directly next to it.
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kumasasa
169th duplicate of MC-108, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.
migrated
FFS, where can I file a bug report about the bug tracker? I goddamn used the search function, and that bug report didn't freaking show up. Which is exactly what happened with the last 3 bugs I posted.
Edit: I forgot to mention, I've complained about this before. And I was completely freaking ignored. Do yourselves and everyone who wants to report a bug a favor and fix this.
Torabi
The tracker for the Jira software itself, which is what the Mojang bug tracker uses, is located at https://jira.atlassian.com/browse/JRA.