The end of the dungeon duality is bugged, at the end it is in a loop without taking the loot room and the loot is always sent to the post office, torso armor and machine gun, not to mention that even though I finished the dungeon almost 90 times I couldn't get the exotic weapon, the sword, that is, when you buy the dungeon it's not guaranteed that you'll get the exotic weapon, but just a possibility given the circumstances, unfortunately.
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The devs announced on Twitter that they have a [i]potential[/i] fix for the [b]instant death during transition between realms[/b] bug lined up for the Hotfix on October 18th. As this bug is likely an issue centered around the teleportation mechanism within the Dungeon, fixing it [i]might[/i] also address the issue you’re having with not being teleported to the rewards chest upon clearing the final boss. We will have to wait to see if this is the case (and whether the intended fix works more broadly). (΄◉◞౪◟◉`)