Whilst running a Winterfest prestige mission in a party of four, I noticed something odd; one of the other members was carrying a Faust, and used it to hit a Layoafer, which resulted in the Layoafer getting cursed. I could quite clearly see the status symbol and purplish haze hovering around the monster. However, the wiki states that the entire fiend family, other than Silkwings and Greavers, are immune to Curse status.

Has anyone else seen something similar? (I'll try to recreate the event so I can get a screenshot later.)