Happens pretty much every 3rd run. We beat the boss and game bugs out. Doors don't open and we have to go to orbit. No way to progress. Happens randomly. One time it happened just before the end. 1 hour lost. I haven't seen them address this at all.
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They're aware of the [url=https://www.bungie.net/en/Forums/Post/263836164?sort=0&page=0]portals not spawning[/url] and [url=https://www.bungie.net/en/Forums/Post/263835375?sort=0&page=0]doors getting bugged[/url]