At least 2 different battlegrounds are bugged in guardian games vanquard playlists. You cannot proceed to the boss room because the door opens when you enter the area. Inner door remains closed. There are no seals to shoot.
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This just happened to our team twice in a row during the Heist Battleground: Moon GM. Both times we thought it was suss that there was no progression timer in the middle room for the connection, then exactly as described.. door opens with the champions and it's soft locked.