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DataReader Dynamic Writing Blanks Instead of Nulls

See original GitHub issue

var csvRecordConfiguration = new ChoCSVRecordConfiguration
                                     {
                                         Delimiter                  = "|",
                                         AutoDiscoverColumns        = true,
                                         AutoDiscoverFieldTypes     = true,
                                         ThrowAndStopOnMissingField = false,
                                         QuoteAllFields             = true, IsDynamicObject = true,
                                         FileHeaderConfiguration = new ChoCSVFileHeaderConfiguration
                                                                   {
                                                                       IgnoreColumnsWithEmptyHeader = true,
                                                                       HasHeaderRecord              = true,
                                                                       QuoteAllHeaders              = true
                                                                   }
                                     };

        var parser = new ChoCSVReader(file, csvRecordConfiguration).Select(row =>
                                                                           {
                                                                               row.FileLogId   = 183874;
                                                                               row.ProcessCode = "T";
                                                                               return row;
                                                                           })
                                                                   .AsDataReader();

using (var copy = new SqlBulkCopy(connectionString))
        {
            copy.DestinationTableName = tableName;
            copy.EnableStreaming      = true;

            foreach (var mapping in columnMappings) copy.ColumnMappings.Add(mapping);

            copy.ColumnMappings.Add(new SqlBulkCopyColumnMapping("FileLogId", "FileLogId"));
            copy.ColumnMappings.Add(new SqlBulkCopyColumnMapping("ProcessCode", "ProcessCode"));

            copy.WriteToServer(parser);
        }

If I write just using the datatable its correct, but the reader it writes blanks which is incorrect.