One of the most popular games at the moment, Black Myth: Wukong, is reportedly not on Xbox Series X|S due to a non-publicized exclusivity clause between Sony and developer GameScience.
According to IGN and Forbes, previous claims stating that the Xbox version was delayed because of a technical memory issue were inaccurate. Instead, the game is reportedly currently a console exclusive–at least for now–on PlayStation 5.
Neither Sony nor GameScience have said anything about possible exclusivity deals, but GameScience said the game is currently being optimized on Xbox. Microsoft also put out its own statement about Black Myth: Wukong.