Posting this here since it may be a mod issue, but I have seen regions declare independence with noculture/noreligion in 2.2. Had a CTD when Media (one of my added regions) declared independence, couldn't really see anything since I was Carthage and the game CTD the very same day, so it I assumed there might be something I missed with my added regions.
Well started a game (Parthia in 644) where I could provoke the governors to declare independence, eventually they did, and both Persia & Media was noculture/noreligion. For good measure I provoked the Parthia region to go independent as well and they also had noculture/noreligion and as I had not done anything to them (apart from reducing the number of provinces that make up that region) it does seem like this may still be an issue with the game occasionally failing to give revolting regions culture and religion.
As to how to fix this, it is possible to use the event-based approach, but wondering wether it might not be preferable to actually provide the regional countries with history files with default religion/culture, it does work for Galatia and Cyrenaica; have seen Egyptian Cyrenaica so those default cultures and religions would only become used in those situations it would otherwise be noculture/noreligion.
Well started a game (Parthia in 644) where I could provoke the governors to declare independence, eventually they did, and both Persia & Media was noculture/noreligion. For good measure I provoked the Parthia region to go independent as well and they also had noculture/noreligion and as I had not done anything to them (apart from reducing the number of provinces that make up that region) it does seem like this may still be an issue with the game occasionally failing to give revolting regions culture and religion.
As to how to fix this, it is possible to use the event-based approach, but wondering wether it might not be preferable to actually provide the regional countries with history files with default religion/culture, it does work for Galatia and Cyrenaica; have seen Egyptian Cyrenaica so those default cultures and religions would only become used in those situations it would otherwise be noculture/noreligion.