This is typical with Bluetooth. it's not direct, so you don't get quite as much volume out of it. Wiring anything is always better quality than anything wireless. Internet, for example.
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.
