They answered nothing, they are just saying (If we find the bug, we will fix it) they never said (we know about this bug)
I did read the effects of this skill mirage, (Aggro Reduce)
Code:
Shows a mirage created from the horror of darkness to Monsters, when they attack, Monsters stuck in Mirage reduce their hostility.
To me that means
Cast Mirage, mobs hostility will be reduced, Monsters should avoid you? Bug?