Wait what ????
For some reason a broke feature is suddently working as it should and you consider it as a bug ?
Oh wait, It's Bioware and SWTOR... no surprise then !
I think the problem many are having is that this supposed "bug" was in game since 1.2. Everyone that's been killing him for most of that time had their way with it and got all geared out easier. Now you complain that people just getting to him or having recently gotten there should have the harder time of the whole thing. If a bug exists that makes the game easier for a certain amount of time, it should just stay that way. Put the mechanic "fixed" in Nightmare mode, that's fine, but you shouldn't change things to make them tougher after this amount of time.