After killing Khajin the Unyielding the first mobs that you pull on the bridge are 3x Aqua Rager’s & 2x Aqua Ragers + Primalist Icecaller + Primalist Earthshaker
They will get pulled, randomly go Immune to damage, and then reset. I have no idea what is causing this as I am pulling normally, I am doing this in a +16 HOI M+ key.