What is happening:
There is a lever attached to some redstone wire attached to a piston with an unpowered Powered Rail one block below the piston. The unpowered Powered Rail must be at an angle. The redstone wire is also attached to the powered rail. When I turn on the lever, the powered rail and the Piston turn on, but when I turn the lever off, the powered rail turns off and the Piston still has its arm out.
What I expect would happen:
When I turned the lever off, I expected both the powered rail to turn off and the Piston arm to retract.
How to re-create:
P = Piston
B = Polished Andesite Block
W = Block with Redstone Wire on Top
A = Air
R = Powered Rail (must be at an angle)
L = Lever
Side View:
ABWAAAAAAAA
APBWAAAAAAA
RBAAWAAAAAA
BBWABWAAAAA
AABWBBWAAAL
BBBBBBBWWWB
Top View:
RWWWWWWWWWL
BBBWBBBBWBB
BBBWWWWWWBB
Environment
OS: Windows Vista Build 6002 Service Pack 2
CPU:total 2 (2 cores per cpu, 1 threads per core) family 17 model 3 stepping 1, cmov, cx8, fxsr, mmx, sse, sse2, sse3, mmxext, 3dnowpref, tsc, tscinvbit
Memory: 4k page, physical 2880612k(1354396k free), swap 6007536k(4152888k free)
vm_info: Java HotSpot(TM) Client VM (25.31-b07) for windows-x86 JRE (1.8.0_31-b13), built on Dec 17 2014 20:46:12 by "java_re" with MS VC++ 10.0 (VS2010)
time: Sat Jan 23 10:30:02 2016
Linked issues
duplicates 2
MC-108
Droppers, Dispensers and Pistons activate when blocks are providing power diagonally or two blocks above
Resolved
MC-11193
The order in which powerable blocks (e.g. redstone dust blocks) along a wire are powered or de-powered is not clearly defined and causes a non-deterministic behavior for redstone contraptions
Open
I do not think this is a duplicate of MC-108.
MC-108 specifically requires an active redstone power source (albeit, not directly connected to the piston).
As you can see in this bug, there are NO active redstone power sources anywhere - the lever is OFF, as you can see that the redstone attached to the lever is unpowered.