Here are the minor bugs I found playing first v57 version CP / CBP / CSD / Civ4 diplo features (vassal) :
- CSD creates liberation quests for cities annexed by Austria, and as far as I know those cities CAN'T be liberated
- the AI deal interface has a feature that doesn't work anymore : when you ask "what will it need to make it work ?" sometimes they say it won't possible or no deal would be acceptable for us, then you add 10 gold and they accept, so this feature doesn't work anymore. It worked in vanilla.
- an AI voted for me as host in world congress but we're not friends anymore, they just denounced me (but maybe they hated the other AIs even more than they hate me ?). They shouldn't vote for me if we're not friendly...
- When an AI capitulate (and becomes my vassal), if he gives me a city state he conquered long ago, if I choose to liberate it immediately, the city state doesn't appear in the city state list and I can't talk to them ever. Reloading the game doesn't change anything. If I take the city, liberate it, THEN make him capitulate, then it works, the city state is back.
- When Congress gives serveral projects simultaneously, one of them will usually stay unused (nobody works on it) or nearly unused for some time, and wonder buildings seem to get a lot slower. I'm not sure, it feels the opportunities aren't assessed correctly.
Tactical blunders (they're probably in vanilla game too) :
- Enemy land units stay under my boat fire turn after turn... They should hide and heal.
- Enemy boats are kept near his cities although I'm fighting 5 squares away his land units and he could use them to attack my boats or my land units.
- Sometimes enemy boats stay under my enemy fire turn after turn. They should hide and heal.
- Sometimes sends boats in a closed lake or at the north pole, in closed places where he can't escape and those boats will be forever useless.
Tuning :
- I saw winning AIs accepting peace too soon (where they could clearly take other cities).
- Probably not enough siege units, they usually lacked some siege units to be able to take cities
- My AI war friends generally don't help me at all in wars, they barely send units as long as it's a bit far, they just declare war and don't bother after that, then there's a peace treaty.
- Naval invasion is mostly non existant, but that's pretty hard to do.