Ok so. In our coop run the first mission we did was the cosmonaut for the HOD beacons.
Turns out doing that screws your game up because doing that facility FIRST locks everything inside.
Soooo after we spent 3-4 hours beating the rest of said campaign acts and gettingnthe rocket train set up. The game wanted us to gi BACK to the cosmonaut facility to pick up the beacons AGAIN. effective getting us stuck and locked inside the building unable to do anything or even repeat the mission AGAIN