vanish bug?

[Pesticide]

I was fighting a DK and the fight wasn't going my way so I vanished, cloak was on cool down but I knew vanish gives me 3 seconds that he can't see me and no damage I take from his dots will cause me to break stealth. During that vanish he never lost his target of me and kept attacking me..this has to be a bug right?

[Deleted]

Vanish is broken since vanilla wow. Has and probably will never be fixed. Happening to me also.

[InFlames-]

Dont know about you but from my experience with vanish fucking up has been since the WotLK times, I miss vanishing stuff.