They work fine for me. I had them off before the beta, and until just now to test them for you. I was and to turn them on and change what is shown and they work as they should. I've got the flashlight on the left and camera on the right.
Please try clearing the system cache and rebooting your device.
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.
