Pretty sure I'm using the latest Lithuania, but I redownloaded just in case. It still happens; I end my turn, it gets to Kongo's, there's a bit of a hang, the game starts again, then there's a second hang that crashes it.
I used the in game editor to see if there was anything off with the Kongo, but I saw nothing out of the ordinary (Lithuania is also not in the game). I did notice that Boudicca apparently is the leader of "the Celts" when I'm using Hiram's Celtic split pack, but I don't think that matters. I'm going to try an earlier autosave and see if it still crashes at the same turn.
Aaaaand it does. The mysteries of Kongo's turn.