StreamWriter along with XmlSerializer in DotNet6 does not write WhiteSpaces?

Question

Actually I tried this basic code in C# which serializes the DataSet into XML document.

static void Main(string[] args)
{
    XmlSerializer ser = new XmlSerializer(typeof(DataSet));

    // Creates a DataSet; adds a table, column, and ten rows.
    DataSet ds = new DataSet("myDataSet");
    DataTable t = new DataTable("table1");
    DataColumn c = new DataColumn("thing");
    t.Columns.Add(c);
    ds.Tables.Add(t);
    DataRow r;
    for (int i = 0; i < 10; i++)
    {
        r = t.NewRow();
        r[0] = "Thing " + i;
        t.Rows.Add(r);
    }
    StreamWriter writer = new StreamWriter("DemoNet5.xml");
    ser.Serialize(writer, ds);
    writer.Close();
}
Copy

And this creates the "DemoNet5.xml" file with proper WhiteSpaces and Indentation in .NET 5. But When I try to run the same code in .NET 6 I am not getting the WhiteSapces and Indentation so that the contents of the xml are written in single line.

Later on when I try to read that .xml document I face issues. Is there someone who can help me with this ? I want my xml contents to be in proper format that is with proper indetation and WhiteSpaces. Xml file created using .NET6 I have also attached the XML document created using DotNet6.