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Me and my brother played 2 campaigns before the Bestmen DLC without any desync issues in the battles. I'm the only one with the DLC installed. I started hosting a campaign where he plays the Dwarfs and we got to around turn 40-50 before we encountered the first desync in a battle. Most battles up to that point had been auto-resolved. We tried loading the auto-save multiple times, but the battle desynced at more or less the exact same time (around 5 minutes in to the battle). Finally we gave up and auto-resolved that fight as well only to run into the same desync issue in the very next fight we tried to play (me or him as spectator). The client gets a message about the host having left the game. The host gets a desync error.
To rule out connection problems we started a multiplayer battle and was able to complete without any issues. After that we loaded one of our old saves from the previous campaign where I played Greenskins and he played Chaos. We had no problems in completing a large fight there either.
Our next step was to start a new Beastmen/Dwarf campaign, but this time with my brother as the host. This time the desync showed up after only 9 turns in a fight where the Greenskins attack my brothers main army that is garrisoned in Pillars of Grumni.