Settings > Connections > Mobile Networks > Network Mode > Select "LTE/3G/2G"
That should fix the problem.
this will switch it from LTE to 5G. worked great on mine even when I was worried but you can always go back to the LTE option. give it a try and tell me how it goes.
Thank you for your feedback. Network connectivity issues will most likely be resolved more effectively by contacting your carrier directly. If issues, persist, however, please send us an error report to help us debug the issue. Please also keep an eye out for any other issues you may encounter. We apologize for the inconvenience and appreciate your contribution to the beta program.
One UI Beta Team