[MC-11503] 1 tick pulse piston bug Created: 10/Mar/13  Updated: 14/Sep/16  Resolved: 14/Sep/16

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 1.8.1-pre3, Minecraft 1.8.7
Fix Version/s: None

Type: Bug
Reporter: traks Assignee: Unassigned
Resolution: Duplicate Votes: 4
Labels: piston, pulse, random, redstone, tick, unreliable
Environment:

Mac OS X 10.6.6
java version 1.6.0_22-b04-307


Attachments: PNG File 2013-03-10_17.37.34.png    
Issue Links:
Duplicate
duplicates MC-11193 The order in which powerable blocks (... Open
is duplicated by MC-11643 Piston activation bugs Resolved
CHK:
Confirmation Status: Confirmed

 Description   

I found a weird bug a while ago. Sometimes, when you power a double extender with pistons facing up with redstone going in to it, either the top or the bottom one will fire.

How to replicate:
1. make a 1 tick pulse shortener by placing redstone, a piston with a block on top next to it and a repeater behind that (as in the pic).
2. connect a redstone wire to the repeater and go one block out every other block and put redstone on top of that (like in the pic).
3. place 2 pistons on top of each other at the end of each redstone wire pointing out, so the wire goes into the pistons.
4. press the button.

Note: you won't always get a weird result, it's very un-predicatable.



 Comments   
Comment by SunCat [ 08/Sep/16 ]

Relates to/dupes MC-11193

Comment by Galaxy_2Alex [ 25/Oct/14 ]

Reopened, thanks

Comment by traks [ 25/Oct/14 ]

Yes, the bug is still prevalent in Minecraft version 1.8.1 Prerelease 3. I added it to the list of affected versions.

Comment by Galaxy_2Alex [ 25/Oct/14 ]

Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 / Launcher version 1.5.3 or later? 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 Calvin Stromwall [ 17/Jun/14 ]

Even though the pistons on top of each other are powered in the same tick, they are powered in a certain order, which is based on complicated redstone stuff. It's basically random which one fires first.

Comment by DicoTheRedstoner [ 10/Mar/13 ]

That doesn't really add much to the issue. Its the inconsistency which just has to be fixed, it should just not be random.

Comment by RedJokerFTW [ 10/Mar/13 ]

this is because you are powering 2 pistons at the same time (1 whit the redstone and 1 whit the block where the redstone is on top). They made this so your game won't crash. Far as I know it is random where the bottom piston and top piston fires first.

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