[Bug Report] Citadel Boss drifting out of arena area

[Malakim]

Mission cannot be finished, because the Citadel boss drifted out of the arena and does not move. https://i.imgur.com/emmsIWN.png

[Malakim]

Can't even reach it by charging it, because i get teleported backwards when i get within ~200m of it, well before the timer runs out