It That Was Esh and It That Was Tul invulnerable bricking the fight

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Both bosses got invulnerable after I got the second tot he life breakpoint for it to switch. Boss fight is bricked as it just keeps casting spells without taking any damage and the fight doesnt progress. I have quite some damage so it can be related to the same bugs from last league when people reported that instaphasing them would bug them.

Same issue, take bosses to 2/3 hp, and the nothing happens