Yes, the expidition was certainly fun... But...
My coop friend started it, which lead to my game crashing instantly. After restarting I was able to play, but to never return to my primary save, as it was bugged - including the terminal.
I thought that finishing it could help (as the terminal mentioned "Unable to pause, complete expidition first"). Nope. 9hrs later same problem. In the end I had to merge the expidition-savegame with my primary save using the NMS savegame editor. With some help from a known good save I was even able to reconstruct the final terminal state (stating that I finished the expidition).
What a mess.
Instant thought: "Ausgefressen - Moritz Matthies". Good stuff.