New Game of Thrones play The Mad King might retcon Jon Snow's season 8 plot

It turns out Jon Snow's Game of Thrones season 8 plot might not be set in stone in George R.R. Martin's books, thanks to a major revelation in new play The Mad King. Spoilers follow for Game of Thrones: The Mad King, so turn back now if you don't want to spoil the play! GamesRadar+ attended a perfor…