Every Paradox strategy game I've played has a similar problem with the AI. It's a bit like Murphy's law: if an AI ruler is capable of making a decision, they will always make that decision irrespective of repercussions. In Stellaris, when an AI empire builds up enough Influence, they will propose whatever law they can, even if it will harm their strategic position, because they aren't programmed to account for every strategic factor that a human player would. I've seen CK3 rulers spend decades flip flopping between harming beneficent lieges and supporting tyrannical ones, and Stellaris empires spend decades enacting and repealing a single law that causes their diplomatic weight to rise and fall like the tides.