If you host a server yourself online, for example to play co-op missions with friends, it is not possible as host to leave the mission (e.g. to load a previous savegame) without having to save the game. There is only the option Save & Exit, no option to leave the game without saving. This is super annoying. If we want to load a previous savegame in a co-op mission, we all have to kill each other first so that the mission has failed.