Angel of Strife bug - takes damage while invincible

[Elindor]

His passive is taking damage for each ally that would get to less than 50% health when taking an attack. His special which cost 6 has a chance to taunt but also gives him invincibility and immunity for 1 turn.

Invincibility should negate all damage done. Still, if an ally takes damage that would lower their HP to less than 50% health, the Angel takes the damage despite invincibility - defeating his very purpose as a tank.

[Elindor]

Today after using my special with the Angel of Strife, AOE damages were applied ot him, even when no ally was going under 50% HP. His invincibility is really bugged