I did a small test abandonment to see if post-abandonment artifact functionality had been improved in this version.
Every single time I tried to reclaim the fortress, or enter the site in adventure mode, the game crashed on me.Having taken note of the fact that books were also acting kinda weird in adventure mode, I figured it had something to do with the buggy artifacts from DF2010.
I collected the books, stuffed them in my backpack, and this happened.
So I start a new fortress to test this theory. All abandons and reclaims were perfectly stable until my first artifact was made. I copied the file and did three different abandons of the same fortress: one while the artifact was being made (works), one with the finished artifact still in the workshop (crashes), and one with the artifact in a stockpile (crashes). Hoping Toady will fix this soon, because this a pretty big deal in our planned Succession World.
Edit: Well, 1 out of 4 of my artifact fortresses were recoverable, so it's probably something a lot more general. Possibly having to do with the fact that visiting the functioning site as an adventurer reveals that it is still populated with all the dwarves that were supposed to have abandoned the place. It's still a whirlwind of random crashes, usually as an indirect result of trying to sleep or leave the site while holding an artifact.
Speaking of DF2010, artifacts are similarly screwed up there. Artifacts outside of bins or workshops will vanish from existence when you abandon (I DFusion'd the site to turn off item scattering, trust me, they're gone). When reclaiming a site, if you deconstruct an artifact building or artifact-containing-workshop, the artifact will likewise poof away. When you drop an artifact in adventure mode, you will not be able to pick it up. But if you go back to the building it was inside of when you abandoned, it will still be there in essence, and you'll be able to pick it up an infinite number of times; causing the version you dropped/are holding/are wearing to disappear from existence. If you try to leave the site with one of these silly things, it will immediately vanish from your inventory; meaning you can't hoard priceless artifacts, which I feel is practically the whole point of visiting abandoned fortresses in adventure mode.