There's this one, at least. The other one I was thinking of was the book duplication bug linked from that report, but that was apparently already resolved and I forgot.
As far as I can tell this has been a problem since the dawn of Dwarf Fortress. And I say it's about time Toady got around to addressing it. Because if you can't reclaim/adventure into a fortress and pillage priceless relics from it, as opposed to just having them disappear from existence the second you abandon the fortress, then what the hell is the point? It feels like fortress-raiding is missing something fundamental.
Or heck, maybe even introduce a way to store artifacts in locked chests, crypts, and etc. So that finding artifacts doesn't just amount to a randomized Easter Egg hunt.
The trouble is that dwarven artwork usually exists in a state where the description only materialises when the artefact is first viewed by the player. This means that besides the base material and type of object or artefact and the materials used for the decorations, the image is based on events previous to the player viewing rather than the object being constructed, so an artefact may end up having an image of itself on it. Statues were (from what I have read) made to depict events, people, objects, and creatures in DF2010 so they may behave differently.
Please correct my statement if it is wrong.
In the future, abandonment should result in the loss of some fortress items as your dwarves pack up and leave (almost certainly weapons, artefacts, food, booze, trinkets, and coinage). The most likely dwarf to take the item should either be the dwarf using the item at the time of abandonment (i.e. military dwarves) or the dwarf who made the item (in the case of crafts).
Loss because of sieges should probably result in the loss of some items due to plundering, while items further away from the map edge and behind drawbridges or in places where invaders cannot path will probably be left alone. Loss due to forgotten beasts or other events should result in some limited item scattering.