While not a bug per se, the AI is too fond of making it sons into bishops when they have ecclesiastical education. Too often the eldest son will be made bishop and therefore never marry (in some extreme cases I've seen every son of a duke get ecclesiastical education and become a bishop appointed by their father). The AI should be taught not to make its sons into bishops (or at least, not the eldest son, and perhaps some chance of appointing younger sons with ecclesiastical education as counts instead).
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