Had to bail on a solo run of Encore due to this weird bug. Got to the final room, took a dumb early death, and was respawned back in the portal room that has secrets in it. I had just done the secret with the pods prior to starting the boss fight if that helps. No way to escape, as all the portals are inactive, and the pathway to walk out as you do earlier in the mission is shut off. I even equipped a rocket after the attached video ends to blow myself up, but I respawn in the same place. Hope you can get this fixed soon.