When you put a redstone block on a piston or sticky piston facing up and power it, it will extend, but depowering it won't close it until you remove the redstone block because the block is giving it power when it isn't supposed to.
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gaspoweredpick
Possible duplicate of MC-108
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MC-108 seems to be for outdated versions of Minecraft, and should it really be working as intended, as in another edition of Minecraft (Windows 10 Edition/Pocket Edition) this event does not occur, it just retracts as usual.
Skylinerw
@@unknown It is working as intended for the MCPC version. See this developer comment by @unknown on that report:
Actually it is working as intended because it is a bug turned feature by demand of the community. Would you rather have is break all existing maps and make certain constructs impossible?
Try making a 10x10 wall of pistons that all move together without this quasiconnectivity (use that mod above).
If you can make alternatives for all the existing structures we might consider it.
Windows 10/PE editions decided against this implementation and introduced the Observer block instead. That block may be extended to PC edition, but that is a feature request and as it stands the current behavior is intended.
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Okay, then. I guess I'll just have to get over that feature then or put a suggestion on the subreddit.
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If you put that on subreddit, the entire redstone community will shut it down. (just saying)