PoE2 Rathbreaker bugged out

I moved too far away from the arena (took the path to the right) and it followed me a bit and then ran back. After that it stopped moving & attacking and has massive regen

+1

It now happened three times in a row. I cannot facetank the hyaenas and if I don't move away a bit I get body locked / stun locked so I think I have to move.

The regen afterwards is just absurd. I can bring him down to 75% quickly but before my mana is back even with flash he's back at 100%.

Cannot progress atm. Out of ideas.

You can kill yourself to reset map (or control click on its waypoint on map screen)