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* on Xbox Series X|S, all our Xbox One games will be backward compatible. On PlayStation®5, all games will be backward compatible except the following ones: Assassin's Creed Syndicate, Assassin's Creed Chronicles Trilogy Pack, Assassin's Creed Chronicles India, Assassin's Creed Chronicles China, Assassin's Creed Chronicles Russia, Risk, Star Trek Bridge Crew, Werewolves Within, Space Junkies.News - Ubisoft Connect
https://www.resetera.com/threads/ubisoft-connect-not-all-ubisoft-ps4-games-will-work-on-ps5-list-of-unsupported-games-in-op-update-section-removed-from-website.316237/page-3#post-49898866
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There is definitely something to these claims. As I mentioned in the PT compatibility thread, the new https://library.playstation.com web site has an API which can query the BC compatibility of PS4 games.
If you put in some of these games they return a state of bootable rather than compatible: