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Playing the Slaanesh campaign I have 2 defensive alliances. While playing everything is fine. Loading a saved game after a certain turn (95 in my case) both allies turn hostile and declare war. Or more precisely: Have declared war. I can see this in the notifications but this happens only by loading the game, never by actually playing and ending a turn.
The most notable thing that happens is the confederation of the Kislev factions. Other than that nothing special seems to happen.