When onboarding is attempted with no network connection, a blank risk card is shown.
The risk card should say that there is no network connection available, and therefore risk is unknown.
The following screen shot shows the blank risk card:

As soon as WiFi is enabled, keys are fetched and Unknown Risk is correctly shown.
Internal Tracking ID: EXPOSUREAPP-4254
Dear @MikeMcC399,
Thank you for reporting this issue
We have created a ticket for the bug. Any further developments will be notified here in this Github issue.
Best wishes,
DS
Corona-Warn-App Open Source Team
Internal Tracking ID: EXPOSUREAPP-4254
FYI:
Related PR https://github.com/corona-warn-app/cwa-app-android/pull/1751
Related tickets: Internal Tracking IDs: EXPOSUREAPP-4254, EXPOSUREAPP-3881
Best, DS
Corona-Warn-App Open Source Team
No longer reproducible under CWA Android 1.9.1.
Instead, the green Low Risk card is shown with the text:
"Encounters have not yet been checked".
After enabling WiFi, status changes to:
"Updated: Today, hh:mm"