Binding a date input or a date picker to a nullable value causes a build-time error

error CS1503: Argument 1: cannot convert from 'System.DateTime?' to 'System.DateTime'

Sample:

@using Telerik.Blazor.Components.Button
@using Telerik.Blazor.Components.DateInput

<TelerikDateInput bind-Value="@StartDate" Format="MM/dd/yyyy HH:mm:ss"></TelerikDateInput>

@functions {
    [Parameter]
    private DateTime? StartDate { get; set; } = new DateTime(2020, 1, 1);
}