We just ran a party of 3 through the Vox Obscura Master mission where all 3 people already had the exotic and were trying to get the catalyst. We completed it, but had one party member die toward the end of the boss fight. They respawned themself right as we finished the boss, and it spawned him outside of the final room. The room was locked and they couldn't enter to open the chest with us. Because of this, they didn't get the Catalyst drop and they didn't get progress on the Exotic Quest mission. Players should not be respawning outside of the boss room...