Imbued Enigmox moth form unkillable

As the title says, something made the Imbued Enigmox Moth form unkillable. I don't know if it's something we did, or maybe one of the charging rots hit it right when it was supposed to die, or a falling rock, or even a spore. I didn't get to record the part before this to see why, so it's up to the devs to try to sort it out I suppose. We tried for several minutes to un-stuck it and finish the fight and just couldn't get past that part, as you can see that it's simply not taking any damage/no damage numbers are popping up when we hit it. We've killed it before, so it's not always bugged.