Bug Report: Molten Vault Boss Unintended ONE SHOTTING LAVA

The main Bug I wanted to report is that in the fight, especially at the start, the lava instantly kills players.

What I think is happening is that all the lava hotboxes are hitting the player at the same time.
I think the fire is dealing an unintended amount of damage.


Video Proof:
https://www.twitch.tv/videos/2431766326

I have cap fire res in this video.
Please skip to the very end of the video to see my death.
I don't know if "respawning at checkpoint" is central to the bug so I've included the whole segment.


PS: There used to be another bug with Molten Boss (reported by me and other players as well in 0.1).
I was also wanting to test if I can reproduce it in 0.2.

Here's what the 0.1 old video that abuses the bug.
https://www.twitch.tv/videos/2328830494
(Stun boss as he's walking back to the fire to have a free fight)