i was with bow, doing knight profession. i remotely kill Bugbear Raider , sometimes with spell. i have noticed, that they don't drop quest item if was killed in one-shot spell. checked. that's true. if he wasn't killed in one-shot then he drops quest-item ( looks 100% chance ). i don't know about global bug, but saw that mages asking about hitting with hands for quest item in TI ( shield for 20 toads adamantine ). p.s.: I am using neti's bow