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[parlor_tricks]

I had a bunch of rocks just magically teleport to a single tile. No dfhack was used.

I was doing some construction work, which required a 3x2 up down stairway to be constructed in the middle of a full stone stock pile.

I undesignated part of the stock pile and then had the stairs built.

I then had the stairs - unbuilt. Part way through deconstruction - half of my stock pile vanished.
I checked and they seem to have been teleported onto a single tile.

Has anyone else heard of this?

[wagawaga]

To what tile were they moved to? A screenshot (or more than one) could help.
Maybe you accidentally dumped half your stockpile using (d-b-d)?
Did you get any sort of suspicious message spam? Like, job cancellation spam?
Are the moved stones forbidden? Marked for dumping? (check with the k screen)
Is the now half-empty stockpile being refilled?
I also suppose you're using the latest version of vanilla DF, without any mods installed (graphic tile packs aren't mods).

Aaaand that's all the circumstances I can think of. I can't possibly guess any sort of solution without additional information.

[Sidhien]

Best I can come up with is that somehow a cave in happened and pushed the rocks on top of each other. That or a black hole is forming.

[Ieb]

Right now when you deconstruct something, any item in a certain range around that deconstructed tile gets teleported to the same spot as the deconstructed building's material.

[Lich180]

Right now when you deconstruct something, any item in a certain range around that deconstructed tile gets teleported to the same spot as the deconstructed building's material.

This. Its a 16x16 square around the tile that was deconstructed. Quite annoying when you build a floor over a magma pipe for forges, and have to remove a floor tile to place your forge, and the entire stockpile of bars thats nearby jumps into the tile next to the recently removed floor, then blocks construction of your forge, allowing a magma crab to shoot your legendary weaponsmith to death.

[GreatWyrmGold]

...Or just when renovating an aboveground fortress.
I've seen plenty of magma crabs, but none have ever attacked. I'd consider the possibility of a conspiracy, but Bay12 isn't that organized.

[parlor_tricks]

Thanks that bug described above sounds right - I'll see if I can put up a screen shot.

Spoiler (click to show/hide)

http://imgur.com/wRCm2

Hmm let me know if that link works!

(Dwarves have been industrious and are filling in the stock pile, so its not a full 16x16 area when I took the Screenie.

[krisslanza]

Oh that explains why in my aboveground fortress, items kept randomly hopping around the place... confused me.

[Broken]

This is a known bug. It annoyed the hell out of me, but there is a binary patch around that solves this and some other bugs.

Edit: Found it.
http://dffd.wimbli.com/file.php?id=6741

[wagawaga]

This is a known bug. It annoyed the hell out of me, but there is a binary patch around that solves this and some other bugs.

Edit: Found it.
http://dffd.wimbli.com/file.php?id=6741

That's great, thank you for fetching the file.
I never had encountered this bug because of how little I tend to use constructions, but you just saved me a great deal of potential frustration.

[pixl97]

This bug feature is useful when you build a wall around your entire map and fight sieges on the few tiles left on the outside. You can have covered bunkers where a civilian builds and destroys a wall and collect all the goblinite in perfect safety, even while the battle rages.

[wagawaga]

This bug feature is useful when you build a wall around your entire map and fight sieges on the few tiles left on the outside. You can have covered bunkers where a civilian builds and destroys a wall and collect all the goblinite in perfect safety, even while the battle rages.

I suppose the vacuum left by the unconstructed wall is pulling items in. Now if only it also pulled goblins it would be much more weaponizable.
Just out of curiosity, does it work across z-levels too? And through walls?

[Xob Ludosmbax]

Internally, the map is divided into 16x16x1 chunks; the bug pulls everything in the object's chunk to the given tile. 

So, if you consider (1,1) to be the corner, and you deconstruct something at (16,16), everything between (1,1) and (16,16) gets moved, but if you deconstruct something at (16,17), everything from (1,17) to (16,32) gets moved, and of course, if you deconstruct something at (21,18), everything from (17,17) to (32,32) gets moved. 

Spoiler (click to show/hide)

Each blue square contains a 16x16 section of tiles.  If you deconstruct something anywhere within that blue square, all of the items within the blue square get teleported.  The blue square has no relation to where you deconstructed the thing, it is measured from the corner of the entire map. 

Edit: correction: changed 24s to 32s.  (x+8) != (x+16)

[parlor_tricks]

I can understand 1,1 to 16,16 being chunk 1.

But how does it apply in your example for 1,17 to extend only till 16,24?

That's a y axis of only height 7, shouldn't it be height 16? so you would be going from 1,17 to 16, 32?

[Hurkyl]

This. Its a 16x16 square around the tile that was deconstructed. Quite annoying when you build a floor over a magma pipe for forges, and have to remove a floor tile to place your forge, and the entire stockpile of bars thats nearby jumps into the tile next to the recently removed floor, then blocks construction of your forge, allowing a magma crab to shoot your legendary weaponsmith to death.

I get the feeling this isn't hypothetical. 

...Or just when renovating an aboveground fortress.
I've seen plenty of magma crabs, but none have ever attacked. I'd consider the possibility of a conspiracy, but Bay12 isn't that organized.

They do. The last time I built my fort inside the rim of a volcano, it took me forever to figure out where all that spinning basalt was coming from. Although, I didn't seriously try to track it down until the first serious damage done, shattering the arm of my carpenter.

I think had been agitating the crab it by dumping refuse into the volcano; I don't know if that makes a difference.