The bug is still alive and kicking. A month ago I lost a mace and a bronze plate mail to chaos NPC but apparently I still had them. Slew the chaos and retrieved duplicates. Thing is the multiplied items did not disappear. I still have both of my bronze plate mails. The whole event appeared to me as one time thing thus it was let go.
Today another player reported the same in chat after getting mauled in Snake Pit. No idea if his accessory is still there but the silver pieces surely will be – they should be merged into original stack, presumably guaranteeing them not being seen as a duplicate.
Long story short: items still duplicate on death sometimes.