Username is not filled in EdgeClient in the Modern customization

We trying to use the new "Modern" Customization page in PReact with the VPN SSL.

We use the EdgeClient (16.1.6.0), but in standard mode the username field is filled with the previous one, and saved in the client.f5c file, but not in the Modern mode maybe because of the Preact way to build the form.

Is there a lot of user of the "Modern Customization" ??

Thank you