Hyena Boss Bug

Was making some attempts at the Act 1 Hyena boss, discovered that if you run back down the cliffs, the small Hyena Demons appear to infinitely respawn, and the boss returns to his starting position and cannot be damaged (even after I return to the top of the cliff), bricking the encounter.

fought Hyena boss, died, lead to invalid quest state and cannot ressurect

I'm also experiencing this (first time I encountered him). If the map is reset, the bug is no longer present, and at least on one occasion, it does not re-occur.

Reproduction steps:
- Engage boss fight
- Walk back down the entrance slopes
- Observe infinite spawning hyenas
- Observe invincible boss

Lvl 19 Sorceress

Equipped skills (support) (pls don't judge):

Firebolt (Ignition)
Incinerate (Eternal Flame)
Ember Fusillade (Fast Forward, Controlled Destruction)
Frost Bomb (Magnified Effect, Frost Nexus)
Frostbolt (Glaciation, Chain)
Orb of Storms
Flame Wall (Hourglass)
Cold Snap (Unleash)
Raging Spirits (active)
Arctic Armour (inactive)

Can post passive skills and character sheet if needed, but I've a feeling they don't affect it.