Is anything else acting up? Like, RPG-style games telling you there’s no room to create a save even though there’s actually enough free space? Or is this the only game with the issue?
If other games are also wonky and you are confident everything that matters is synced to the cloud, you could try the factory reset option that just removes the account profiles but leaves the games and apps in place, then re-add your profile. The game saves should re-sync when you first launch them. Not sure if this would help in your case, but it’s faster than a complete wipe and reinstall everything.