Did they change!? the 4th boss Mechanics? ''King Narilmor'' Coz now Tank Can not gather the clones no more and pull into corner so can AOE them down.
No matter what we tried Tank could not agro them.
Yes it was changed in scalebreaker IIRC. It was a ninja change though.
You can get them together still just is a little more clunky if using corner method. Run to corner -> Three will move to middle and not any further -> Run to other corner to drag other boss to mid. Not super stacked but close enough.