Nested object null even though map exists

[fruitbatinshades]

I am brand new to mapster and trying to get my head around the concepts.

The dam in this map works if mapped directly but is null when mapped from the DBO to the DTO directly. All nested objects are null, What am I missing? :)

 public abstract class AnimalDBO
    {
        public int AnimalId { get; set; }
       public string AnimalName { get; set; }
        public string DamBreed { get; set; }
        public string DamHBN { get; set; }
        public string DamHBNFlag { get; set; }
        public int? DamId { get; set; }
        public string DamName { get; set; }
        public short? DamSocietyId { get; set; }
        public string DamSRCode { get; set; }
   }

 public class AnimalDTO
    {
        public int AnimalId { get; set; } //Fres
        public string AnimalName { get; set; }
        public DamSummaryDTO Dam { get; set; }
    }

     public class DamSummaryDTO
    {
        public string Breed { get; set; } = "";
        public string HBN { get; set; } = "";
        public string HBNFlag { get; set; } = "";
        public int? Id { get; set; }
        public string Name { get; set; } = "";
        public SocietyEnum? SocietyId { get; set; }
        public string SRCode { get; set; } = "";
    }

Here is the mapping I created

    //Mapping
    TypeAdapterConfig<AnimalDBO, AnimalDTO>
      .NewConfig()
      .TwoWays();

  TypeAdapterConfig<AnimalDTO, AnimalDBO>.NewConfig()
      .Unflattening(true);

  TypeAdapterConfig<AnimalDBO, DamSummaryDTO>.NewConfig()
      .Unflattening(true)
      .TwoWays();

//Convert record to type to check all fields are mapped
AnimalDBO animalToTest2 = TestAnimalDBO.Adapt<AnimalDBO>();
//Mapster... Dam here maps correctly
var dam = TestAnimalDBO.Adapt<DamSummaryDTO>();
//convert dto to base
AnimalDTO dto = animalToTest2.Adapt<AnimalDTO>();

//dto.Dam here is null :/
/*
    Expected property back2Dto.DamBreed to be "02", but found <null>.
    Expected property back2Dto.DamHBN to be "DamHBN", but found <null>.
    Expected property back2Dto.DamHBNFlag to be "H", but found <null>.
    Expected property back2Dto.DamId to be 99999, but found <null>.
    Expected property back2Dto.DamName to be "Dam Name", but found <null>.
    Expected property back2Dto.DamSocietyId to be 2s, but found <null>.
    Expected property back2Dto.DamSRCode to be "1 ", but found <null>.
*/