I was just the unlucky recipient of a game breaking bug while on the final boss of Infinite Archive. When the dragon spawned in, it landed in the safe area around the AOE, but was stuck and unable to move or attack. As soon as I killed the manticora, the game said that I died, and since I was on my last thread, my run was forcefully ended. When the screen popped up showing my progress, I was able to run around the arena as it was resetting, and after a few seconds, I was pulled into the ground and brought back to the lobby. Checking CMX showed that I wasn't killed since it would've said that I lost all my magicka and stamina. It really sucks that I was minutes away from Inkslayer only for a bug to end the run.