I started playing from the Aegon's conquest bookmark, took over quite a bit of Westeros (everything except the Iron Islands and Dorne) before I turned my attention to the Summer and Basilisk Isles. I thought everything was fine before turning my attention back to Westeros. The mega-war system fired like normal, but upon conquering Dorne, the Summer Islands along with Narth broke away. Normally, I'm pretty chill about the occasional bug and brush it off as an excuse for a bit of roleplaying, but in this case I lost my dragon conquest CB on the now free and independent kingdoms.
What gives?
What gives?