After chasing the BigCabal guy through the maze, killing him, then looting the chest, the objective marker points to a vex timegate. The timegate isn't active, resulting in the inability to leave the mission area without fast travelling back to the light house.
The adventure counts as complete though, so thats something.
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Hello, Thank you for your report. We are aware of this issue and are currently investigating. As you had discovered, players who encounter this issue may fast travel to another location or return to Orbit after activity completion.