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.
Related issues
is duplicated by
MC-107471
When you push Observer block with same direction with piston, it can't trigger the second times
MC-107474
Observer block stays in powered state when updated/pushed quickly
MC-107524
Piston and Observer block glitch
MC-107580
observer blog strange behavior while pushed with piston
MC-107656
Observer Block leaves powered redstone wire
MC-107689
Observer Block Constant On After Being Pushed By Piston
MC-107894
Observer block retains powered state.
MC-108110
observer permanently active until has deplaced by a piston
MC-108150
Observerblock not detecting update
MC-108249
Observer moved by sticky piston gets stuck in permanent on-state.
MC-108500
Observer do not update itself
MC-108548
Observer Redstone State Bug
MC-108603
Piston-Pushed Observer Gives Constant Power
relates to
Attachments
Comments
migrated
G4me4u
Confirmed.. Reason is correct too. When they're updated the moment before they're pushed, they'll stay in powered state 🙂
migrated
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.
Erik Broes