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.
Related issues
is duplicated by
MC-254
By pushing the sugar cane with a piston, it is defective
MC-2316
Minecraft Piston/Repeater/Sugarcane, Possible Bug?
MC-2896
Pistons Malfunction Badly
MC-3418
Pistons creates piston heads when they break sugar cane
MC-3686
Piston doesnt rectract though it has no signal, if a neighboor piston farms a pumpkin.
MC-3767
Piston doesn't retract with texture glitch
MC-3997
delets cake and duplicates extension of sticky piston
MC-4015
Pistons won't retract when power is removed unless they're broken.
MC-4033
Top pistons on another piston appears retracted, but stays extended.
MC-4095
Extended Pistons Bug
MC-4332
piston stuck in a position where it was both pushing and retracted at the same time
MC-4908
pistons duplicate themselves when in banks of two powered by torches in creative
MC-4995
Bug in three piston as a water gate. Just see a screen
MC-5051
Pistons glitch out.
MC-5307
piston pushing sugar cane
MC-5371
Piston Visual and Contact Glitch
MC-5865
Piston Glitch
MC-5975
Quantum Piston condition
MC-6005
Redstone Blocks disabling Pistons
MC-6087
piston tile glitch:retracted piston with extended arm
MC-6244
when pistons push down on sugar-cane. the piston (when retracted), the piston both retracts and stays extended
MC-6400
Piston Arm Glitch
MC-6490
Piston Breaking
MC-6623
Buggy piston behaviour when other pistons are close by
MC-6624
Pistons randomly get completely stuck (not BUD stuck - completely, irreversibly stuck)
MC-7228
Sticky Piston bug/glitch: non-functioning sticky pistons.
MC-7315
Piston extension / retraction bug
MC-7382
Pistonhead Bug
MC-7511
Double Headed Piston Glitch
MC-7577
Piston Bug
MC-7710
Piston moving block bug
MC-7806
Piston bug
MC-8060
Dispenser Get Stuck, Broken Pistons Against and Broken 32x32 Rendering Texture Packs.
MC-8063
Piston Head Retraction failture
MC-8595
When usinf bud switch. Piston mutiples when piston updates
MC-8617
weird piston bug
MC-9716
Piston extension bug
MC-10240
Sticky piston pushes and doesn't push at the same time
MC-10853
Ghost Piston?
MC-84316
Stickypiston glitch
relates to
Attachments
Comments
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Erik Broes
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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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.
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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.
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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.
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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.
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Adding comment to suggest looking at MC-3686 for easily reproducable version.
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i have the same problem in 1.4.5 and that hapens on cakes doors shugarcane i dont know any more 🙂
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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.
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It can also happen in East / West direction - it's about how you power it: http://i.imgur.com/Jh6gF.png
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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.
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Yeah at first, I also only got the bug in N/S direction because I powered it different
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Confirmed in 1.4.7
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Confirmed in 13w01a-b, this time caused by new Redstone Blocks. Description and a couple of ways to reproduce here: MC-6005
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Or I'll just attach a couple of images
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Another screenshot of 30w01b - exactly this setup did bug the piston out everytime it pushed the sugarcane
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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.
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I have found another way to produce this bug - as a byproduct of another bug I seem to have found in issue MC-6486.
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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.
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Attached a world that shows this happening to normally powered pistons.
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In creative mode, you can break the extended arm of the piston and it (temporarily) returns to normal operation.
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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.
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@Charlie McFadden
Worse than the piston cloning a block glitch, it's the dreaded block cloning a piston glitch!
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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.
megascience
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.
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Woohoo I can't wait until my sugarcanefarm works again
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it's resolved! 😃
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Correction: it's SUPPOSEDLY resolved. TO THE TESTING RANGE!
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exactly xD
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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.
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Press the plus button next to the attachments header and upload using that instead.
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@Christian
Thx that worked. And it added the comments that were supposed for the screenshots in the commentsection. :/
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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.
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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 ?
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nvm. It wasnt fixed in the snapshot were it was supposed to be fixed, but in the newest one it is fixed.
kumasasa
Reopened.
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Confirmed for 14w27b.
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i have it in 14w28b (broke iron farm!)
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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?
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This is about the stuck state, not the animation. Unable to reproduce in 1.8
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Well, some moderators have been marking reports about the visual glitch (such as MC-65314) as duplicates of this one, so I was confused.
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Oh, you are right. I have no idea then.
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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.
kumasasa
Relinked the wrong duplicates to MC-59564 and re-resolved this ticket.
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This is back in 15w32b!!! Oh no!
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Oops the one on the right appears it is stuck but it is pulsing, but the one in the middle is glitched.
kumasasa
@@unknown: MC-59564
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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.
[media]I have not tried to reproduce the bug in other contraptions or configurations.