It has gotten worse after the update, usually just one ghost/add but last night we had 3. Had to wipe 4-5 times and finally killed the boss but all 4 ghosts/adds were still providing a shield.
That bug is getting old, it's been around for years. We had to wipe three times the other day just to get that shield to go down. It's a dps issue if you dps the ghosts too fast the shield stays, we finally had one person just heavy attach each one one by one and then it dropped.