Agreed. I even go so far as to say that this is a bug in the Blazor component and not a feature request. The component's dropdown shows the time using a traditional time format (that is, showing a ":" between the time parts). No one displays a time where the minutes or seconds are shown with a single digit.

Case in point, we've had users issue bug reports to our helpdesk with one of our apps due to the time display in the dropdown.