It's not a bug. It's a game strategy that allows you to use an easy-to-farm f2p character to deal a bit more damage in SOME of the phases in the new sith raid. And that's unacceptable because way too many players have access to it. You are not supposed to crack heroic without a couple of thousand of bucks in your guild so it's' getting fixed. Pretty much any other similar tactic will be "fixed".