Last two times doing this, during the first phase and before first stun of second phase (when he relocates), I haven’t been able to hit him at all because it says this for some reason (yes, have even gone well under what I know to be my max weapon range, which is 1200). But once CoJ relocates and we finish the first stun, it registers my hits as normal.
Now, I know a single player especially won’t do much DPS in a highly scaled group event, but it does affect life siphoning and combo abilities which makes things more frustrating.
Both times I was using a hammer Rev, and as far as I can tell it hasn’t affected other classes and has only started happening after the patch.