Buggy piston behaviour when other pistons are close by
When placing pistons horizontally adjacent but vertically one level apart, the upper piston won't retract until the lower one does.
In the case I tested this I used three pistons:
side view:
- - - - - -
- - - - - -
r R S S S -
S S S P P - - - - P'S'-
S S S S S -
top view:
r R S S S -
- - - R R -
- - - r r -
r = Redstone Wire
R = Repeater
S = Sandstone
S'= Sandstone with Repeater and Redstone Wire in front of it (see top view)
P = Sticky Piston
P'= Sticky Piston with Repeater and Redstone Wire in front of it (see top view)
T = Extension of an activated piston
- = Air
I then activated first the lower repeaters then the upper one:
- - - - - -
- - - S S -
r R S P T -
S S - T P - - - - P'S'-
S S S S S -
- - - S - -
- - - T S -
r R S P T -
S S - T P - - - - P'S'-
S S S S S -
The upper piston will now only retract if all repeaters are deactivated.
Environment
Java Version 7 Update 7
Windows 7
Linked Issues
Created Issue:
Buggy piston behaviour when other pistons are close by
When placing pistons horizontally adjacent but vertically one level apart, the upper piston won't retract until the lower one does.
In the case I tested this I used three pistons:
side view:
- - - - - -
- - - - - -
r R S S S -
S S S P P -- - - P'S'-
S S S S S -top view:
r R S S S -
- - - R R -
- - - r r -
r = Redstone Wire
R = Repeater
S = Sandstone
S'= Sandstone with Repeater and Redstone Wire in front of it (see top view)
P = Sticky Piston
P'= Sticky Piston with Repeater and Redstone Wire in front of it (see top view)
T = Extension of an activated piston
- = Air
I then activated first the lower repeaters then the upper one:
- - - - - -
- - - S S -
r R S P T -
S S - T P -- - - P'S'-
S S S S S -
- - - S - -
- - - T S -
r R S P T -
S S - T P -- - - P'S'-
S S S S S -The upper piston will now only retract if all repeaters are deactivated.
Environment
Java Version 7 Update 7
Windows 7
duplicates

Please provide some screenshots.
tried to recreate the issue today:
the lower picture shows the setup ... activation order: BACCBA caused the described bug yesterday, today it worked fine though ... maybe something system workload related?
OTOH: found two other bugs while testing: first picture: rapid toggling of the lever caused the sticky pistons to loose the sandstone blocks
second: found a way to recreate
MC-6624reliablyDuplicate of
MC-127.