No, that bug has long since been fixed."AI only suffers land attrition from its own units, while the player suffers attrition based on troops from all countries. Furthermore, attrition for AI units is calculated by each individual unit as opposed to the sum of all units on a province; so as long as all AI units on a province remain below its respective supply limit, then all AI units on that province will not suffer attrition."
That is on the EU4 Wiki, is it accurate?
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