I was transported to the Alien Dimension and died trying to get out. My mission marker now says I need to find a way out of the alien dimension and the mission description says I need to return to the station. The quest marker is also on the station (Guardian-17).
However, docking will not complete the mission.
Found that the solution was to return to the Alien Dimension via the portal that sent me there in the first place.
However, both the mission marker and the description should revert back to “head to [sector] and investigate” if you die in the Alien Dimension.