Posting as a question first rather than a bug, as it's possible this has just changed from early access and I've not worked out the new way it works.
However, in the druid grove I was pickpocketed, and only noticed the theft after it had happened, at which point I got the "Find Your Belongings" quest. The quest updated correctly up to the point where it said "We arrived in the thieves' hideout. It's time to get our stuff back." But then I got stuck.
A bit more info in spoiler tags ...
In early access, I could ask Mol for my stuff, but I don't seem to have that dialogue option any more. I rummaged around and found a chest with Barth's locket in it, which i recovered, but there was no sign of my stuff there or anywhere else I could see. Though admittedly I've not tried pickpocketing Mol, it feels as though we should be able to do this through dialogue as we could before.
Of course, it doesn't help that I'm not wholly certain what was stolen and therefore what I'm looking for!