PCG might want to reconsider this and provide the current situation correctly in PCG. That is: Northern Ireland is part of the United Kingdom.
By having Northern Ireland "belonging" to the Republic of Ireland in PCG, is a real can of worms...... Remember the "Troubles" in the 70s and 80s?
Visited the Republic and the North in October 2019 and noticed this. Mentioned this during an event in Belfast and got away with it thanks to being a foreigner.
Can not be that hard to correct, however county Ulster is partly in both. (They gave up sorting out the border somewhere around 1923.
Might influence Challenges like All of Ireland and All of United Kingdom as well.