Error converting type: Bug or implementation issue - please help about serialize.linq HOT 3 OPEN

[DataContract]
  public class OutputChannelLogTest
  {
    public string CreatedBy { get; set; }
    public string Channel { get; set; }
  }

[Test]
    public void CreateQuery_GivenExpression_ShouldGenerateReport()
    {
      // arrange
      Setup();
      var emptyList = new List<OutputChannelLogTest>().AsQueryable();
      var query = emptyList.Where(x => x.Channel == "Email");
      var expression = query.Expression;
      var settings = new FactorySettings(){UseRelaxedTypeNames = true};
      var expressionSerializer = new ExpressionSerializer(new JsonSerializer(), settings);
      var expressionText = expressionSerializer.SerializeText(expression);

      Console.WriteLine(@$"Expression: {expression}");
      Console.WriteLine(@$"ExpressionText: {expressionText}");

      var dbItems = Builder<OutputChannelLogTest>
        .CreateListOfSize(4)
        .TheFirst(2)
        .With(x => x.Channel = "Sms")
        .TheNext(2)
        .With(x => x.Channel = "Email")
        .Build();
      var dbQuery = dbItems.AsQueryable();


      // action
      var reportItems = dbQuery.Provider.CreateQuery<OutputChannelLogTest>(
        expressionSerializer.DeserializeText(expressionText));

      // assert
      reportItems.Count().Should().Be(2);
    }