Terrace Boss bug

Went into Terrace Boss arena and did enough damage to insta-phase it, but it bugged out and froze in the middle of the arena. Hovering mouse over it does not show healthbar or outline. Boss model still visible and in idle animation. Environmental effects (chilling orbs and towers in the pool) still work as normal while boss in invulnerability phase. Unable to complete map because boss can't be killed.

screenshot:
https://drive.google.com/file/d/18QXJc084C03nA5e8HS-MpyNw8vt4iptK/view?usp=sharing