Some Ubisoft's PS4 games will not work on PS5, including

Assassin’s Creed Syndicate and Assassin’s Creed Chronicles are among the few Ubisoft titles that will not make the leap to Playstation 5.

Assassin's Creed Syndicate - PS4 & PS5

Ubisoft+ Is Coming to PS5, PS4, with 50 Classics Free for PS Plus Extra, Premium By the End of the Year

Can you play PS4 games on PS5? PlayStation backwards compatibility

Assassin's Creed: Mirage - Playstation 5 : Target

AC UNITY // Requesting Ubisoft to tweak the game on PS5 : r/playstation

Ubisoft Announces PS5, PS4 Multiplayer Game Project Q, Not a Battle Royale and No NFTs

Ubisoft is unsure which of its PS4 games will run on the PlayStation 5

Ubisoft releases its own list of PS4 games that won't work on PS5

Assassin's Creed Odyssey - PS4 & PS5