[MC-11390] Can duplicate blocks with fast firing piston Created: 09/Mar/13  Updated: 07/May/15  Resolved: 09/Mar/13

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Minecraft 1.5
Fix Version/s: None

Type: Bug
Reporter: Andrew Whitaker Assignee: Unassigned
Resolution: Duplicate Votes: 0
Labels: clock, hitbox, piston, push, pushed, pushes, redstone
Environment:

win7x64, intel 2600k, gtx 680
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b05)
Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)


Attachments: PNG File 2013-03-09_00.34.02.png    
Issue Links:
Duplicate
duplicates MC-631 Duplicating/deleting blocks Resolved
Confirmation Status: Unconfirmed
Game Mode: Creative

 Description   

relates to:

https://mojang.atlassian.net/browse/MC-1677

https://mojang.atlassian.net/browse/MC-5726

if a block is placed on the face of a horizontal, fast firing piston during a small window where the piston is retracted (aim for bottom edge), the block can be duplicated.
(not seeing any open copies of this bug, it seems to be a repeat offender though)



 Comments   
Comment by Andrew Whitaker [ 09/Mar/13 ]

it appears so. block disappears on reload and update as well. (also caught the piston "deleting" blocks,like the video in that ticket) so please feel free to close and link. Sorry for the dupe.

Comment by Kumasasa [ 09/Mar/13 ]

Then it's a duplicate of MC-631 , isn't it ?

Comment by Andrew Whitaker [ 09/Mar/13 ]

On further inspection, the created block (farthest from piston) Is solid, and can be stood upon and cannot be walked through from the side, but does not drop a block when mined. I suspected it could be a block id conflict with 2 instances of the duped block (blackbox test assumption) so i duped the block in survival, switched to creative, removed the block that would have dropped a birch log item wen pined, switched back to survival, and tried to mine the dupe block, but it still did not drop anything.

Comment by Andrew Whitaker [ 09/Mar/13 ]

to duplicate in survival mode (and be able to mine the blocks "in flight") I used Birch logs and a diamond ax with "efficiency V".

started with a stack of 64 Logs, screencap shows 63 on hotbar + 2 on piston after placing 1 that got duped to 2.

Comment by Kumasasa [ 09/Mar/13 ]

Please attach a screenshot.

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