I’m not sure what causes that, the new ward threshold mechanic or the fact that stunning bosses interrupts their actions, but bosses use their abilities too often. That makes some bosses really hard, when they use two huge AOE abilities at once.
Here’s the clip of a poor streamer trying his best 
I also had hard time with Julra, not sure if it’s connected with the bug. Usually she uses the clock slam first. My build had enough DPS to kill her before the clock slam going off, but she used a different ability, totem summon. I killed her, look at the loot, and then die, didn’t expect for something else to be able to kill me after Julra is dead.