Would you please consider allowing a "subsidize fort costs" subject interaction? I suspect that the AI doesn't know how to deal with forts well when it is super poor, which will be often since they always increase local autonomy if you feed them land. I've noticed tons of vassal bankruptcies even when they aren't fielding any units, and I've never seen them mothball forts in these situations - I've treated vassals far worse in 1.11 (200% overextension feeding during internal conflicts and -3 stab), and they fielded decent armies and didn't go bankrupt (though I had to kill millions of rebels), so I really suspect that this has something to do with the AI inability to pay for forts.I'll see about tweaking the AI to prioritize forts more when they just have one or two like this. Especially if they're a march.
Alternatively, display the information of how much in debt a vassal is so I can bail them out. This could be done on the subjects or the declare war screen (since the information for allies and enemy allies already displays how much they are in debt)
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