Hello, so I have encountered this bug multiple times, both on solo runs and with a friend. During the fight, I believe mostly when the Brig shows up, I would end up instantly dying with considerable health. While I would be under fire from snipers, the boss and other enemies, nothing would be hitting hard enough to deliver enough damage for instant death like that, especially in moments behind cover after the brig finished its barrages. I'm guessing this bug is only affecting a fraction of the player base, as my friend did not experience this in a meaningful way, at least not to the degree it was obvious. Hopefully this can be resolved soon, along with the other bugs impacting this mission.
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I had the same experience specifically at the boss when the brig shows up. Ruin my solo flawless run... Before. I thought I was dying to random traps that spawned in, but like you I was in the back big open area. Full health, then bam, dead. I assume it's a visually bug, dying to artillery that doesn't visually load in.