[MC-92434] Slime block piston arrangement duplicates sticky piston

I was attempting to make a slime block gate based on https://youtu.be/F7JkZvsG5WM and in the middle of the video there is a test showing just the redstone portion. I used cobble for parts not touching the gate.

In the following three images, switching to lower extends all but the last piston, though the repeater delays are set correctly. Toggling back off doesn't retract properly, toggling it on again creates a duplicate sticky piston. When I initially tried this, I missed some cobble stuck to the piston, and it appeared to duplicate the cobble as well. However, I removed the cobble to see if that was a factor, and the screenshots show what I can duplicate.

Related issues

duplicates

MC-54026 Blocks attached to slime blocks can create ghost blocks

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migrated 2015-11-08T22:55:04Z

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migrated 2015-11-08T22:58:00Z

I didn't see at the time I reported, but this also duplicate the slime blocks. Dirt is close to the bottom of the extension, and the ground may have also been in the way. I will try to find out more info if this appears to be something entirely new.

migrated 2015-11-08T22:59:41Z

The slime blocks were duplicated, the grass/ ground may be an issue.

migrated 2015-11-09T00:59:40Z

OOog! I return to look at it later, and it has the correct count of blocks even though I didn't do anything to correct it. I toggle the switch, and the "dupe bug" is gone, the pistons no longer move from slimeblocks (which may be new but expected behavior, I don't know yet). So until I can duplicate this again, I simply don't know. It may be related to other update issues where the server is confused about what blocks are actually updated.

I can attempt to duplicate this and see if I can get actual "dupe items" when the server has more people on it and is more "busy".

migrated 2015-11-09T06:04:16Z

AND I can't duplicate the bug after all, or get dupe diamonds or gold off of it. I have to wonder if it is a "lag glitch" I observed, or "confused state" of the server like some other bugs noted such as the one with the pressure plate. After a server reboot, while the pistons are not being moved by the slime block (1.9 "feature/ fix"?), the test system behaves as I would expect with pistons unable to be pushed or pulled.