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I've already played this map 10 times to catch all the bugs and so on.
Here's the situation: it happens approximately every third game, at different stages. It's unlikely that it's related to the AI mod; the issue is simply that in a certain situation, when two heroes are in a castle, this kind of traffic jam occurs.
It's surprising how the developers could have overlooked this.
By the way, is there a way to expand the castle's area of access?
Or maybe make the caravans "transparent" so that they can be passed through? That would be the ideal solution.