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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same problem, i've done it yesterday and now i can't start 2nd and 3rd one. "already active" says on mission. So i guess i need to wait for fix ?