This has just happened to me too. I lost an Eyes of Sulani. I didn't realize it was tied to analyzing samples, but I'd just failed at analyzing three to four samples, and that same sim day I noticed the item missing.
Argggh. This bug ate up my conservationist canoe and I have no backup that still has it. This really needs to be fixed, it is a very lame way to lose your precious items!
August - last edited August
First noticable items disappear at 0.24 and at 0.36 video is low quality but you can see items disappear from the inventory. Was hoping this would have been addressed in today's patch.
Yeah, I just posted about this on the Sims forums. I lost a handcrafted guitar, a violin, a fully upgraded Sim Ray (that one kinda hurt) and now that I read this thread, I notice my ear beads are gone as well. And yes, I've been analyzing samples. Who knows what else is missing, so I'm glad I'm done with the career.
4 weeks ago
As of September this is still happening, and if your inventory is empty of everything except the conservationist vials and research block things it'll delete the research block things that you get for successfully analyzing samples too.