[MC-107662] Observers can cause blocks to be stuck in the powered state when being pushed by pistons Created: 28/Sep/16  Updated: 12/Oct/16  Resolved: 12/Oct/16

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Minecraft 16w39a, Minecraft 16w39b, Minecraft 16w39c, Minecraft 16w40a
Fix Version/s: Minecraft 16w41a

Type: Bug
Reporter: Aeledfyr Assignee: [Mojang] Grum (Erik Broes)
Resolution: Fixed Votes: 23
Labels: None

Attachments: PNG File 2016-09-28_17.40.44.png     PNG File 2016-09-28_17.41.35.png     PNG File 2016-09-28_17.46.19.png     PNG File 2016-09-28_17.50.28.png     File 2016-10-02_02-26-25.mov    
Issue Links:
is duplicated by MC-107471 When you push Observer block with sam... Resolved
is duplicated by MC-107474 Observer block stays in powered state... Resolved
is duplicated by MC-107524 Piston and Observer block glitch Resolved
is duplicated by MC-107580 observer blog strange behavior while ... Resolved
is duplicated by MC-107656 Observer Block leaves powered redston... Resolved
is duplicated by MC-107689 Observer Block Constant On After Bein... Resolved
is duplicated by MC-107894 Observer block retains powered state. Resolved
is duplicated by MC-108110 observer permanently active until has... Resolved
is duplicated by MC-108150 Observerblock not detecting update Resolved
is duplicated by MC-108249 Observer moved by sticky piston gets ... Resolved
is duplicated by MC-108500 Observer do not update itself Resolved
is duplicated by MC-108548 Observer Redstone State Bug Resolved
is duplicated by MC-108603 Piston-Pushed Observer Gives Constant... Resolved
relates to MC-107730 Oberserver block powers air blocks Resolved
Confirmation Status: Confirmed


If an observer block is pushed by a piston at the same time as it is sends a redstone signal, the block it would power after being pushed is stuck in the powered state until it gets a block update. If you build the structure in the first screenshot, and then place a upward facing observer on top of the redstone, the block on the right will stay powered. Also, if you build the structure in the fourth screenshot, the block below won't be powered when the observer updates until you give it a block update.

Comment by G4me4u [ 29/Sep/16 ]

Confirmed.. Reason is correct too. When they're updated the moment before they're pushed, they'll stay in powered state

Comment by Daniel Burnett [ 01/Oct/16 ]

An extension to this: if you place a sticky piston facing sideways into the input of an Observer and power the piston, the observer block will constantly remain powered, even if you retract it, update it, etc.

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