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.
It's been better for me as well. Before Beta 6 I was having intermittent sending issues with text, but since beta 6 and Google message updating to enable RCS I haven't had any issues.
