I am playing Imperial campaign in co-op and the mission Beasts and Monster in the harvest system crashes my co-op player out of the game 100% of the time. I assume it's because of the newly introduced environmental effect. It drops him back to the main menu and he has verified integrity of game files and ran into no issues.
As a clarification, the coop player can load into the map but is immediately dropped back to the main menu as soon as both players ready. I would assume it is related to the spawn in of the specific environmental effect on this mission. We have not completed this mission yet so I don't know if running into this effect later will crash the coop player.