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1. Lu Bu's Greatest Warrior mechanics do not trigger upon defeating an enemy if you play the battle, but do if you autoresolve. 2. No missions trigger for either player when in a MP campaign, this makes playing Lu Bu or Sun Ce almost impossible.
Both of these issues can be replicated by starting a new campaign and should not require an in-progress savegame, any new MP campaign started with Lu Bu in the AWB start will have this issue.
EDIT: Added three save files in a .7z file. The quicksave is before Lu Bu manually fights the battle, and two manual saves showing Lu Bu not getting the greatest warrior marked as completed, and a save from both players showing no missions.