I could not replicate this bug with the newest version of my mod, specifically v0.3.1. Ran three observe games that all carried the war on beyond the first day and well into 1070-1080.
It's possible there's a version conflict. Older versions of my mod added fixes/tweaks to the wars file in the history folder that subsequent paradox patches rendered redundant. If the game tries to load one of those files, it will end the war the next day as that tweak is no longer in the mod. Delete the tweaks folder from your mod directory and do a fresh install and see if that helps.
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