Wales has no De Jure counties, how do I create it?

So for the entirety of my game I decided to not create Wales due to the succession issues when having more than one kingdom. However, after creating the Empire of Alba, I want to create Wales.

Problem is, Wales doesn't have any De Jure counties, even though it says there is one. Its only De Jure title is a Powys, which has no counties, which I own.

Here is a screencap showing what I mean

How do I go about creating Wales?