[MC-9341] Powering 2 pistons extends the wrong piston! Created: 07/Feb/13  Updated: 06/Mar/13  Resolved: 28/Feb/13

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Snapshot 13w06a, Snapshot 13w07a, Snapshot 13w09a, Snapshot 13w09b
Fix Version/s: Snapshot 13w09c

Type: Bug
Reporter: Chris Assignee: [Mojang] Jeb (Jens Bergensten)
Resolution: Fixed Votes: 2
Labels: None
Environment:

MAC OSX


Attachments: PNG File 2013-02-08_22.08.05.png     PNG File 2013-02-08_22.55.19.png     PNG File Schermafbeelding 2013-02-07 om 19.12.04.png     PNG File Schermafbeelding 2013-02-07 om 19.13.43.png    
Issue Links:
Duplicate
is duplicated by MC-9795 Double piston extender with torch on ... Resolved
is duplicated by MC-9939 Weird piston behaviour, wrong piston ... Resolved
is duplicated by MC-10252 Possible piston/redstone glitch Resolved
Relates
relates to MC-9342 Piston retracts an extended piston wh... Resolved
Confirmation Status: Unconfirmed
Game Mode: Creative

 Description   

I powered 2 pistons facing upwards on top of each other with a torch, I expected the bottom piston to extend first and after that the top one like it did in all previous versions.

Instead it extends the top piston. (There is also a visual glitch, it looks like the bottom piston extends but in fact the top one does)

How to reproduce:
1. Build the setup from my picture.
2. Activate the lever.
3. Notice that the top piston extends instead of the bottom piston.



 Comments   
Comment by kbk [ 27/Feb/13 ]

Affects 13w09b.

Comment by DicoTheRedstoner [ 17/Feb/13 ]

Please fix it, its so damn annoying!

Comment by Chris [ 09/Feb/13 ]

Powering a piston diagonally with a block is a BUD. I don't think BUDs are bugs.
Powering pistons diagonally with a torch is NOT a BUD. That is normal behavior.

Because of this Bug you can't make a simple double extender anymore. (the extending circuit always was activated by 1 torch, now you have to power the bottom piston first and then you can power the torch.)

Comment by kbk [ 09/Feb/13 ]

I've been just sharing my findings on what I had understood in the description you wrote. Your latest comment makes things alot clearer, but for my opinion current mechanic is alot more expected because it does not show symptoms of well-known piston quasiconnectivity bug. I will surely check this in 1.4.7 later...

Comment by Chris [ 08/Feb/13 ]

It's not ONLY a visual glitch, it should extend the bottom piston first and after that the top piston.
(btw I don't know why you added 2 pictures, I don't think it makes it clearer.)

Comment by kbk [ 08/Feb/13 ]

This report is 50% cooler with clocks and really needs a better explanation.
Firstly, this is more like a visual glitch, and less like an unintended redstone component behaviour. Secondly, I cannot reproduce this when both pistons are oriened horizontally, but this happens to bottom piston regardless the direction of the upper (unless it is not downwards). And I also feel like this behaviour could probably be caused by recent fix of MC-8198.
So i guess the report should be called something like "When powering piston on piston wrong piston looks preparing for extension" to avoid confusion, amirite?

Sorry for fastediting.

Comment by Manuel [ 08/Feb/13 ]

i can confirm this

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