In TrueNAS-SCALE-21.02-ALPHA.1, the UPS driver cannot be set. Any selection from the list results in a "This field is required" validation message and the configuration cannot be saved.
Steps to reproduce:
1. Configure UPS service
2. Fill in all mandatory fields, including selecting ANY driver from the list.
3. Attempt to save
The driver field displays a validation message as if no value has been entered and the UPS service configuration cannot be saved.
The valid driver selection should be accepted.