For the PS5 and Xbox Series X, I do understand why their 2020-2022 games (No matter 1st or 3rd party) are shared with their respective predecessors because these two consoles are very hard to find, due to shortage.
In 2023, I'm guessing that majority of gamers are already waited for these two for so long so that's why there are quite a lot of games being cancelled for PS4 & Xbox One.
GTxForza's comments