Turn the Sound on, then reboot phone and check the ringtones.
You can also try the following:
Go to Settings -> Apps -> Show System Apps -> Ringtone Backup -> Storage -> Clear Cache
If issue persists, please send us an error report with screenshots from One UI Beta App (Beta Feedback -> Send feedback-> Error Reports -> "Select Category" -> Input frequency and Description" -> Send (Top Right Icon). We appreciate your help for supporting beta program.
