I am trying to customize button csvHtml5 but when I use the customize option it downloads the file as the following

Although when I use only the export option it download the file that contains the table data.

Could you please help me to find what the issue of below code as the same code working fine when I extend excelHtml5 instead of csvHtml5?

@{
    ViewData["Title"] = "Home Page";
}
<link href="~/css/Datatables/datatables.min.css" rel="stylesheet" />


<script src="~/js/Datatables/datatables.min.js"></script>
<script src="~/js/Datatables/dataTables.buttons.min.js"></script>
<script src="~/js/Datatables/jszip.min.js"></script>
<script src="~/js/Datatables/pdfmake.min.js"></script>
<script src="~/js/Datatables/vfs_fonts.js"></script>
<script src="~/js/Datatables/buttons.html5.min.js"></script>
<script src="~/js/Datatables/buttons.print.min.js"></script>
<div class="text-center">
    <h1 class="display-4">Welcome</h1>
    <p>Learn about <a href="https://docs.microsoft.com/aspnet/core">building Web apps with ASP.NET Core</a>.</p>
    <table id="myTable" class="display">
        <thead>
            <tr>
                <th>Column 1</th>
                <th>Column 2</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>Row 1 Data 1</td>
                <td>Row 1 Data 2</td>
            </tr>
            <tr>
                <td>Row 2 Data 1</td>
                <td>Row 2 Data 2</td>
            </tr>
        </tbody>
    </table>
</div>
<script>
  
    $(document).ready(function () {

       
        $('#myTable').DataTable({
            buttons: [
                {
                    extend: 'csvHtml5',
                   customize: function (doc) {
                       
                       console.log("content");
                       //console.log(doc);
                      
                    },
                }

                
                
            ],
            layout: {
                topStart: 'buttons'
            }
        }
           
        );
       

    }
    );
   
</script>