[MC-11220] Extending piston causes block update Created: 07/Mar/13  Updated: 09/Nov/15  Resolved: 09/Nov/15

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Snapshot 13w10b, Minecraft 1.5, Minecraft 1.5.1, Minecraft 1.5.2, Snapshot 13w18c, Snapshot 13w19a, Minecraft 1.6.1, Minecraft 1.6.2, Minecraft 1.6.4, Minecraft 13w36a, Minecraft 13w36b, Minecraft 1.7.1, Minecraft 1.7.2, Minecraft 13w48a, Minecraft 13w48b, Minecraft 13w49a, Minecraft 1.7.3, Minecraft 1.7.4, Minecraft 14w02a, Minecraft 1.7.10, Minecraft 14w32d, Minecraft 1.8-pre3, Minecraft 1.8, Minecraft 1.8.3
Fix Version/s: None

Type: Bug
Reporter: Joonas Muhonen Assignee: [Mojang] Grum (Erik Broes)
Resolution: Works As Intended Votes: 7
Labels: piston, redstone

Attachments: PNG File 2013-03-06_21.26.41.png     PNG File 2013-03-06_21.27.03.png     PNG File 2013-03-12_14.11.30.png    
Issue Links:
Duplicate
is duplicated by MC-13349 Turn on one of two vertical Pistons w... Resolved
Relates
relates to MC-108 Droppers, Dispensers and Pistons acti... Resolved
CHK:
Confirmation Status: Confirmed

 Description   

In previous versions of minecraft extending piston didn't cause block update but now it causes. This breaks compact piston machinery
How to replicate: Place a pistons in a row and give a redstone signal to middle one
What used to happen: only piston given signal would extend
What happens now: adjacend pistons exted too



 Comments   
Comment by KingSupernova [ 09/Mar/15 ]

Confirmed in 1.8.3. Intended. A block was changed, so it creates an update. People are confusing this bug with MC-108. They are actually completely separate bugs, they are just often observed together.

Comment by Scott Mulligan [ 08/Aug/14 ]

I can confirm that this issue is still a concern with the distributed 1.7.10 client and the 1.7.9 server versions of MineCraft. Beyond that, I am unable to provide any more information at this time because I am currently traveling.

Comment by [Mod] Ezekiel (ezfe) [ 26/Jul/14 ]

Is this still a concern in the latest Minecraft version 14w30c? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Comment by Scott Mulligan [ 08/Jul/13 ]

Please fix this bug. It is a REAL pain in the neck. We have a world implemented with an extensive rail system and ALL of our rail stations use push-button panels to set the rail switches. The push-buttons are supposed to activate the piston below them, in order to drive the circuitry that sets the rail switches. This has worked flawlessly ever since the official release, but now it is all broken because pushing one button now causes multiple pistons below to fire.

Comment by Scott Mulligan [ 21/Mar/13 ]

I wrote up MC-11957, which was quickly deemed a dupe of MC-108, but in fact it is exactly the bug described here.

In my example, I used buttons to fire the pistons. Rows of pistons above and below a row of buttons. Select a middle button, and one piston above fires. Unfortunately, three pistons BELOW will also fire. This is a big change of behavior.

Comment by Anon Ymus [ 12/Mar/13 ]

Confirmed.

Comment by Daniel "Glampkoo" [ 12/Mar/13 ]

Confirmed in 1.5pre

Comment by Joonas Muhonen [ 07/Mar/13 ]

But before this wasn't happening so something must have changed (previously only one piston extendet) now that piston causes block update and that extends adjancent pistons too

Comment by Kumasasa [ 07/Mar/13 ]

This is strongly related to MC-108, since powered blocks diagonally over the pistons will extend them.

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