POE 2 The game is glitched BOSS KANU , LOST CHARACTER?

BOSS KANU
During the boss fight I died but killed him at the same time. The game is glitched and the mission still has me needing to fight him. I hit escape and respawned at last checkpoint. It does the animation of the second part of the fight but then Kanu rises in the air and then shoots off the screen towards the bottom right. I dont know how to fix this issue.