It may not be a bug - just Larian palying a trick like their Rock of the Hlaberd. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
Though, no i can not confirm this.
Yeah, after all you ARE looting a chest of a wizard. And we all know they have a lot of tricks up their sleeve <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />