Most of the Bug subforums have a sticky topic at the top, like "Known Card Bugs" that list the known issues.
Because it has turned out that the AI can be a spectacular fool (not Fool) at many times and situations ("Hey, Chapel is super good, what do I need those stinky Provinces for?"), there isn't a list where the AI is acting badly (it would be way too long), but the cases where the game stops when the AI "locks up" can be found in the "Card Bugs" subforum in "Known Card Bugs". If you search for "Secret Passage" there, you'll find it at the end, whith the other known cases.