Bug Report: Ignite Mechanic Not Working Properly in POE2

I am a player who mains the Warrior class. Yesterday, I formed a 6-player team to challenge The Arbiter of Ash. During the battle, when I used the "Sunder" skill, a strange glitch took place: I dealt a significant amount of damage instantly and applied the ignite debuff to the boss. However, the subsequent ignite effects failed to trigger entirely-the boss's HP bar remained static. And this issue repeatedly occurred again in my subsequent attempts..

I have thoroughly reviewed my equipment and skills setup and found nothing that would hinder the ignite effect. As a result, I suspect this may be a bug related to the ignite mechanic in the game.

Could be the transition between mech phases where the boss hp doesnt change until he enter a new phase.
Were you able to kill him in the end or you had to leave the arena due to the bug??