Did u use Home csc ?The beta version on G9910 no problem. On Odin I flash as indicate the BL, AP, CSC, for the CP (Modem) I replace it with that of BRI (Taiwan) of the same security date.
Installation of the beta file with ADB without problems.
I deleted all unnecessary Chinese apps. I cannot say if 5g works because my plan does not include it but 4g no problem in France. I don't encounter any particular problem only a few system applications still in Chinese, like bixby.
Thanks to zjhao for sharing the beta links