[MC-127] Piston extended and retracted at the same time Created: 24/Oct/12  Updated: 13/Aug/19  Resolved: 12/Oct/14

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Minecraft 1.4.1, Minecraft 1.4.5, Minecraft 1.4.6, Minecraft 1.4.7, Snapshot 13w01a, Snapshot 13w01b, Snapshot 13w02b, Snapshot 13w03a, Minecraft 14w27b, Minecraft 14w28a, Minecraft 14w28b, Minecraft 14w29b, Minecraft 14w33c, Minecraft 1.8-pre2
Fix Version/s: Snapshot 13w04a

Type: Bug
Reporter: Rick Marrari Assignee: Unassigned
Resolution: Fixed Votes: 61
Labels: BUD, piston
Environment:

Windows Vista,


Attachments: PNG File 2012-10-24_11.17.13.png     PNG File 2013-01-12_15.48.04.png     PNG File 2013-01-12_15.48.10.png     PNG File 2013-01-12_15.48.15.png     PNG File 2013-01-20_02.19.29.png     PNG File 2013-01-20_02.19.44.png     PNG File 2013-02-07_15.26.38.png     PNG File 2013-02-07_15.26.56.png     PNG File 2015-08-06_19.35.33.png     PNG File Extended.png     PNG File FixMySugarcaneFarm.png     PNG File Initial.png     File NetherTrap3.7z     PNG File Retracted.png     JPEG File Step by step description on how to create a completly stuck and unusable piston, part 1.jpg     JPEG File Step by step description on how to create a stuck and completely unusable piston (not that this specific variant of the stuck pistons bug is new in 13w01b!), part 4.jpg     JPEG File Step by step description on how to create a stuck and completely unusable piston, part 2.jpg     JPEG File Step by step description on how to create a stuck and completly unusable piston, part 3.jpg     PNG File double piston head 1.14.png     PNG File howto.png     PNG File howto2.png     PNG File minecraft_piston_bug.png    
Issue Links:
Duplicate
is duplicated by MC-5371 Piston Visual and Contact Glitch Resolved
is duplicated by MC-5865 Piston Glitch Resolved
is duplicated by MC-5975 Quantum Piston condition Resolved
is duplicated by MC-6005 Redstone Blocks disabling Pistons Resolved
is duplicated by MC-6087 piston tile glitch:retracted piston w... Resolved
is duplicated by MC-6244 when pistons push down on sugar-cane.... Resolved
is duplicated by MC-6400 Piston Arm Glitch Resolved
is duplicated by MC-6490 Piston Breaking Resolved
is duplicated by MC-6623 Buggy piston behaviour when other pis... Resolved
is duplicated by MC-6624 Pistons randomly get completely stuck... Resolved
is duplicated by MC-7228 Sticky Piston bug/glitch: non-functio... Resolved
is duplicated by MC-7315 Piston extension / retraction bug Resolved
is duplicated by MC-7382 Pistonhead Bug Resolved
is duplicated by MC-7511 Double Headed Piston Glitch Resolved
is duplicated by MC-7577 Piston Bug Resolved
is duplicated by MC-7710 Piston moving block bug Resolved
is duplicated by MC-7806 Piston bug Resolved
is duplicated by MC-8060 Dispenser Get Stuck, Broken Pistons A... Resolved
is duplicated by MC-8063 Piston Head Retraction failture Resolved
is duplicated by MC-8595 When usinf bud switch. Piston mutiple... Resolved
is duplicated by MC-8617 weird piston bug Resolved
is duplicated by MC-9716 Piston extension bug Resolved
is duplicated by MC-10240 Sticky piston pushes and doesn't push... Resolved
is duplicated by MC-10853 Ghost Piston? Resolved
is duplicated by MC-27200 its a small piston glitch Resolved
is duplicated by MC-84316 Stickypiston glitch Resolved
is duplicated by MC-254 By pushing the sugar cane with a pist... Resolved
is duplicated by MC-2316 Minecraft Piston/Repeater/Sugarcane, ... Resolved
is duplicated by MC-2896 Pistons Malfunction Badly Resolved
is duplicated by MC-3418 Pistons creates piston heads when the... Resolved
is duplicated by MC-3686 Piston doesnt rectract though it has ... Resolved
is duplicated by MC-3767 Piston doesn't retract with texture g... Resolved
is duplicated by MC-3997 delets cake and duplicates extension ... Resolved
is duplicated by MC-4015 Pistons won't retract when power is r... Resolved
is duplicated by MC-4033 Top pistons on another piston appears... Resolved
is duplicated by MC-4095 Extended Pistons Bug Resolved
is duplicated by MC-4332 piston stuck in a position where it w... Resolved
is duplicated by MC-4908 pistons duplicate themselves when in ... Resolved
is duplicated by MC-4995 Bug in three piston as a water gate. ... Resolved
is duplicated by MC-5051 Pistons glitch out. Resolved
is duplicated by MC-5307 piston pushing sugar cane Resolved
Relates
relates to MC-108 Droppers, Dispensers and Pistons acti... Resolved
relates to MC-6486 Variable redstone strength causing st... Resolved
relates to MC-8198 Piston pushing piston bugs / piston d... Resolved
relates to MC-59564 Retracting piston has two heads Resolved
CHK:
Confirmation Status: Community Consensus

 Description   

After placing pistons on top of one another, top piston will remain extended. However, it will still work, but it will prevent an item to be placed in front. It is like a phantom extension that takes the place of the block in front of it.



 Comments   
Comment by Brady Coles [ 13/Aug/19 ]

This bug appears to be back in 1.14.4. I've experienced it several times, but only in one particular contraption, it was not experienced prior to at least 1.14 (ie. it was not present in the 1.14 snapshots). Pistons are unpowered and both extended and not extended. Powering and unpowering the piston resolves the issue (but it leads to slimestone contraptions breaking). It is not guaranteed to occur, and normally doesn't, but I have found these pistons in this configuration at least 5 times in the last several weeks.

Note, there are 8 pistons in this contraption, firing at 4 different times, with several seconds delay between some of the activations, and yet when the pistons become double headed usually most or all the pistons are double headed. I believe the contraption is in spawn chunks (possibly lazy), and is triggered by a daylight sensor, so it might be related to lazy chunks.

I have not tried to reproduce the bug in other contraptions or configurations.

Comment by Kumasasa [ 07/Aug/15 ]

@ShawnTriangles: MC-59564

Comment by Sam Bone [ 06/Aug/15 ]

Oops the one on the right appears it is stuck but it is pulsing, but the one in the middle is glitched.

Comment by Sam Bone [ 06/Aug/15 ]

This is back in 15w32b!!! Oh no!

Comment by Kumasasa [ 12/Oct/14 ]

Relinked the wrong duplicates to MC-59564 and re-resolved this ticket.

Comment by BoxFigs [ 12/Oct/14 ]

Nevermind, I found the right report for the visual glitch: MC-59564

I guess some of the moderators closed some reports as duplicates of this issue instead of that one.

Comment by atomizer [ 11/Oct/14 ]

Oh, you are right. I have no idea then.

Comment by BoxFigs [ 11/Oct/14 ]

Well, some moderators have been marking reports about the visual glitch (such as MC-65314) as duplicates of this one, so I was confused.

Comment by atomizer [ 11/Oct/14 ]

This is about the stuck state, not the animation. Unable to reproduce in 1.8

Comment by BoxFigs [ 10/Oct/14 ]

Does this issue cover both the bug where pistons are stuck in this state (which I cannot reproduce in 1.8) and the visual glitch that always happens when a piston retracts?

Comment by J. P. Coder [ 13/Jul/14 ]

i have it in 14w28b (broke iron farm!)

Comment by Sam Bone [ 03/Jul/14 ]

Confirmed for 14w27b.

Comment by Kumasasa [ 02/Jul/14 ]

Reopened.

Comment by Dlawso the Really Lucky Rabbit [ 28/Jun/14 ]

Its back in 14w26. (MC-59564 / MC-59812)

Comment by Raphael [ 11/Feb/13 ]

nvm. It wasnt fixed in the snapshot were it was supposed to be fixed, but in the newest one it is fixed.

Comment by Fabio Vaz [ 11/Feb/13 ]

Two pistons, one on top of the other, both pushing sugar cane when turned on. The top piston will remain extended when turned off (see attached picture). Is this bug report still active or should I create a new one ?

Comment by asdf [ 11/Feb/13 ]

It has been fixed in the latest snapshot. Not the version that has already been released. If it were fixed in the version that was already released, it would be 1.4.8 instead of 1.4.7.

Comment by Raphael [ 07/Feb/13 ]

@Christian
Thx that worked. And it added the comments that were supposed for the screenshots in the commentsection. :/

Comment by asdf [ 07/Feb/13 ]

Press the plus button next to the attachments header and upload using that instead.

Comment by Raphael [ 07/Feb/13 ]

Well, it says here that this has been fixed, but i actually just encountered this bug in 13w05b. It looks exactly the same like the ones in the screenshots and i also wanted to upload the screenshots i made, but somehow this java popup upload window doesnt work for me; when i press the "paste" button, nothing happens, although the screenshot is in the clipboard.

Comment by Raja Branco [ 24/Jan/13 ]

exactly xD

Comment by asdf [ 24/Jan/13 ]

Correction: it's SUPPOSEDLY resolved. TO THE TESTING RANGE!

Comment by Raja Branco [ 24/Jan/13 ]

it's resolved!

Comment by Sims112 [ 23/Jan/13 ]

Woohoo I can't wait until my sugarcanefarm works again

Comment by MegaScience [ 20/Jan/13 ]

My screenshots (Hoppers, Comparators, and Pistons) is another way to reliably reproduce this problem. Whenever the working piston is placed next to the one that can break, it will. How it is set up: Two Hoppers feed into each other. A single Minecart with Hopper is placed inside, constantly transferring between the two. The Comparators turn on and off in one-tick pulses into the Pistons.

Comment by GCSX [ 12/Jan/13 ]

Added 3 screenshot of a mechanism reproducing this behavior.

The two pistons receive inverted and synchronized power, making their arms to stagger.

The first is the system once built, the second is then system swithed on and the last is the system switched off again.

Notice the bug on the right piston.

Comment by asdf [ 12/Jan/13 ]

@Charlie McFadden
Worse than the piston cloning a block glitch, it's the dreaded block cloning a piston glitch!

Comment by Charlie McFadden [ 12/Jan/13 ]

This bug is very annoying! When I tried making a semi-automatic Sugar cane farm, if would work fine before the sugar cane grew, but when the sugar cane grew to its normal 3 block "ready to harvest" state, I stepped on the pressure plate and all but 2 of the top pistons didn't retract...its like when the pistons broke sugar cane, it cloned the piston arm when it retracted.

Comment by Rolf Campbell [ 09/Jan/13 ]

In creative mode, you can break the extended arm of the piston and it (temporarily) returns to normal operation.

Comment by Rolf Campbell [ 09/Jan/13 ]

Attached a world that shows this happening to normally powered pistons.

Comment by Rolf Campbell [ 08/Jan/13 ]

Every attempt I make to create a Zombie-Pigman farm using pistons is crippled by this bug. The pistons involved seem to randomly get stuck in this quasi-extended state. My pistons that are stuck in this state are powered by a redstone-repeater behind it (at the same elevation). I don't think this bug is limited to oddly powered pistons.

Comment by asdf [ 07/Jan/13 ]

I have found another way to produce this bug - as a byproduct of another bug I seem to have found in issue MC-6486.

Comment by Austin Quick [ 07/Jan/13 ]

Another instance of this bug in 13w01b. Everything needed to reproduce is visible. Piston's glitch when F=0 & F=2.

*Note: The top block must be powered via lever.

Note: the redstone dust below is required for the bug, and must be un-powered at the same instant the pistons are powered.

Comment by Sims112 [ 05/Jan/13 ]

Another screenshot of 30w01b - exactly this setup did bug the piston out everytime it pushed the sugarcane

Comment by Flasheek [ 04/Jan/13 ]

Or I'll just attach a couple of images

Comment by Flasheek [ 04/Jan/13 ]

Confirmed in 13w01a-b, this time caused by new Redstone Blocks. Description and a couple of ways to reproduce here: MC-6005

Comment by Ville Selkämaa [ 01/Jan/13 ]

Confirmed in 1.4.7

Comment by Sims112 [ 29/Dec/12 ]

Yeah at first, I also only got the bug in N/S direction because I powered it different

Comment by Raja Branco [ 27/Dec/12 ]

oh, ok, my bad then, I tried with pistons facing those directions but didn't happen anything, I think I didn't powered them the same way then. My bad.

Comment by Sims112 [ 27/Dec/12 ]

It can also happen in East / West direction - it's about how you power it: http://i.imgur.com/Jh6gF.png

Comment by Raja Branco [ 26/Dec/12 ]

This is also a directional bug, only happens when the piston is facing North/South (F:2/F:0).
To happen, the piston must push something.

Comment by marco de ocampo [ 30/Nov/12 ]

i have the same problem in 1.4.5 and that hapens on cakes doors shugarcane i dont know any more

Comment by Chalmes (Jon) [ 22/Nov/12 ]

Adding comment to suggest looking at MC-3686 for easily reproducable version.

Comment by Mark scape [ 26/Oct/12 ]

Here's a screenshot of the way (I think) Matthew did it: http://puu.sh/1iJUO You can see the top piston is both retracted and extended. It also only happened to me while it was pushing sugarcane.

Comment by Thue [ 26/Oct/12 ]

How to reproduce the bug is described here: http://www.youtube.com/watch?v=A3cidpdOElA . I just verified that it is still in 1.4.2.

Comment by Mark scape [ 26/Oct/12 ]

I've had this problem also. I was able to get the pistons to glitch by powering it like so: http://i.imgur.com/kuzsN.png However, it only happened to me while the top piston was pushing sugar cane. If no sugar cane was in the way of the top piston, it would retract normally.

Comment by Matthew Salsamendi [ 25/Oct/12 ]

This is a repeatable bug. However, redstone power needs to be from one redstone repeater positioned between both pistons (powers the two pistons at the same time) this will break the pistons on top.

Comment by [Mojang] Grum (Erik Broes) [ 25/Oct/12 ]

Are you able to recreate this? it seems only 1 piston out of the manylots is suffering from the problem. A contained testcase would be wonderful.

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