I de-powered 2 extended pistons at the same time. I did not expect the first piston to grab the second piston because they get de-powered at the same time.
But instead, the first piston did grab the second piston.
How to reproduce:
1. Build the setup from the picture
2. Flip the lever(s)
3. Notice that the second piston gets retracted by the first piston.
Related issues
is duplicated by
MC-9614
double piston new behavior ?
MC-9794
With Specific timings, sticky piston doesnt pull other sticky piston, facing eachother
MC-11097
13w10a double piston instant retraction and can't pull block
MC-11268
Vertical double piston extender retract wiredly
MC-11269
Instantly retracting pistons cause blocks to be left behind
relates to
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Confirmed.
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Could not reproduce this in 13w06a, probably for the same reason.
kumasasa
I don't see the bug here: Both pistons are de-powered = both pistons retract.
When both pistons are observed independantly, the order of the two steps doesn't play a role here:
The lower piston is depowered, it retracts and grabs the upper piston.
The upper piston is depowered, it retracts.
migrated
I'll explain:
A piston cannot retract an extended piston.
The retracting of a piston takes time. (about 1 tick, not exactly sure)
The pistons are both de-powered at the exact same time.
That means that the pistons will both retract at the exact same time.
When the bottom piston starts retracting, the top piston isn't retracted yet.
That means the bottom piston shouldn't grab the piston above it, because it can't retract an extended piston.
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Reproducible in 13w09b.
Jens Bergensten
I've decided that this is the expected behavior. If I "fix" it, people will complain that it's much harder to do double-length piston extenders.
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If it would retract both the piston and the block above, it would indeed be easier but that's not the case. It only retracts the piston and it leaves the block, this makes it harder to make double extenders instead of easier.
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@Jeb can you then also make it retract the block?
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If you build the same setup but downwards, the upper piston doesn't retract the lower one, as it was in earlier versions.
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If a bug would make an double piston extender more compact, doesn't mean it is consistent with the rest of the logic of the game.
And this compact double piston extension is also heavily direction dependent and inconsistent as demonstrated in this short video: http://www.youtube.com/watch?v=_eqsc5Q3cko
So I would really hope that this would either be removed or be made much more consistent.
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I honestly hope that this is fixed as Dico suggested, or it is returned to the way it used to be done. As it is now it actually makes the double/triple extenders harder to build.
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Oddly enough, with the horizontal setup, if you place another block and put redstone on top, the pistons behave as they did before.
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I'm gonna miss this bug.
But it definitely was a bug
Jens Bergensten