Core Malachai/piety bug, both invincible

I did core Malachai, after triggering Piety and getting her to about 30% life she just went invulnerable and malachai stayed invulnerable aswell.
I then relogged went back in the map and killed piety normally, killed malachai again and p2 triggered normally.

p2 went as always no problems.

report number: 3,535,114,642

Screenshot taken after p1 before entering p2


(yes i forgot auras after relogging and did half p1 without noticing :/ )