Add and Edit in Cell Edit Template sample does not work

problem in Order.CustomerID cell

@using Syncfusion.EJ2.Blazor.DropDowns
@using Syncfusion.EJ2.Blazor.Grids

<EjsGrid ModelType="@Model" AllowPaging="true" DataSource="@Orders" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Cancel", "Update" })">
    <GridEditSettings AllowEditing="true" AllowDeleting="true" AllowAdding="true" Mode="@EditMode.Normal"></GridEditSettings>
    <GridColumns>
        <GridColumn Field=@nameof(Order.OrderID) HeaderText="Order ID" IsPrimaryKey="true" TextAlign="@TextAlign.Center" Width="140"></GridColumn>
        <GridColumn Field=@nameof(Order.CustomerID) HeaderText="Customer Name" Width="150">
            <EditTemplate>
                <EjsAutoComplete Value="@((context as Order).CustomerID)" DataSource="@Orders">
                    <AutoCompleteFieldSettings Value="CustomerID"></AutoCompleteFieldSettings>
                </EjsAutoComplete>
            </EditTemplate>
        </GridColumn>
        <GridColumn Field=@nameof(Order.Freight) HeaderText="Freight" EditType="EditType.NumericEdit" Format="C2" Width="140" TextAlign="@TextAlign.Right"></GridColumn>
        <GridColumn Field=@nameof(Order.OrderDate) HeaderText="Order Date" EditType="EditType.DatePickerEdit" Format="yMd" Type="ColumnType.Date" Width="160"></GridColumn>
    </GridColumns>
</EjsGrid>


@code{
    public List<Order> Orders { get; set; }

    public Order Model = new Order();

    protected override void OnInitialized()
    {
        Orders = Enumerable.Range(1, 75).Select(x => new Order()
        {
            OrderID = 1000 + x,
            CustomerID = (new string[] { "ALFKI", "ANANTR", "ANTON", "BLONP", "BOLID" })[new Random().Next(5)],
            Freight = 2.1 * x,
            OrderDate = DateTime.Now.AddDays(-x),
        }).ToList();
    }

    public class Order
    {
        public int? OrderID { get; set; }
        public string CustomerID { get; set; }
        public DateTime? OrderDate { get; set; }
        public double? Freight { get; set; }
    }
}