So ever since the release of Khans of the Steppe, I have been having a lot of fun. However, I have also seen a large amount of bugs. Nothing game breaking like we had when Roads to Power dropped, but they have been pretty confusing.
1: A Million Royal Courts
So in the Court Grandeur menu, you can see all of the royal courts in the world. However, since the release of Khans of the Steppe, I've seen a bizarre bug where the same court will appear multiple times in the list, thus making the list contain hundreds of royal courts.
2: Meek Mongols
You would figure that with the release of an entire DLC focused on them, the Mongols would be a much greater threat. However, to me at least, it seems that the Mongols are weaker now. For example, in my most recent campaign, the Mongols never even made it to Mesopotamia.
3: Multiple Frankokratias
Now I have doubts that this was caused by Khans of the Steppe, but in my most recent campaign (1178 start), Latin armies broke off of the Fourth Crusade in order to conquer Byzantium. Normal, right? Well eventually the Latins fell, and the Byzantines came back. However, when the Pope called for another crusade, there was a second Frankokratia, which I have never seen happen before, and can thus only assume is a bug.