I hope this helps avoiding any confusions from now on.
I think that when playing on the PS5 it should open the PS5 version automatically, and then if you want you can download and play the PS4 version but at least this is something.
https://www.videogameschronicle.com/news/a-new-ps5-update-finally-tackles-cross-gen-confusion/
I think that when playing on the PS5 it should open the PS5 version automatically, and then if you want you can download and play the PS4 version but at least this is something.
https://www.videogameschronicle.com/news/a-new-ps5-update-finally-tackles-cross-gen-confusion/