Board Thread:General Discussion/@comment-25539456-20141015001339/@comment-71.201.4.95-20141018180525

Yes, and the article says "While Nelacar claims the Black Star can house only black souls, it can actually hold souls of any type, like standard black soul gems (Note: this due to a developer oversight and is not a bug/glitch)." It is not a bug, the developers just didn't code in the exclusion of white souls.