Thank you for reporting this. We are working on the issue. In this case the waypoint appears on the other side of a closed door because you have entered the hive fortress through the incorrect entrance. When you enter the fortress through this entrance the waypoint system incorrectly directs you to continue further in instead of telling you to turn around. If you launch the the mission again and follow the waypoints exactly it will take you to a different entrance to the fortress and you will be able to complete the mission. Thanks