There should be a way to get a notification whenever you are justifying against a country and another country guarantees them after you start justifying. So for example, as Germany justify against Belgium while no one is guaranteeing them. And then a week before you can declare war, England suddenly decides to guarantee Beligum. So unless you catch it manually, you'll either have to go to war with England too or decide not to declare war which can cause issues. I'd rather get a notification and be able to cancel the justification before hitting the end date.
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