C# AutoMapper with Entity Framework - Works with List but not single nullable instance

Question

I have a very wierd error that I can't get my head around. I'm using AutoMapper 6 with AutoMapper.Collection and AutoMapper.Collection.EntityFramework.

https://github.com/AutoMapper/AutoMapper.Collection

As you can see from the screenshot below, every component is updated apart from Image that is null for updatedContact. If I however do an explicit mapping for only updatedImage it works. It also works to update a collection of images without a problem. Has anyone experienced this? Other single properties works as well but for some reason Image is causing trouble.

//Works
var updatedArticle = Mapper.Map<ArticleViewModel, Article>(articleVm, articleOriginal);
//Every component is updated a part from Image.
var updatedContact = Mapper.Map<ContactViewModel, Contact>(contactVm, contactOriginal);
//Works
var updatedImage = Mapper.Map<ImageViewModel, Image>(contactVm.Image);
//Works
var newContact = Mapper.Map<ContactViewModel, Contact>(contactVm);

Mapping:

cfg.CreateMap<ArticleViewModel, Article>(MemberList.Source)
    .EqualityComparison((src, dst) => src.Id == dst.Id);

cfg.CreateMap<ImageViewModel, Image>(MemberList.Source)
    .EqualityComparison((src, dst) => src.Id == dst.Id)
    .ForSourceMember(x => x.IsDeleted, opt => opt.Ignore())
    .ForMember(dest => dest.ImageBytes, opt => opt.MapFrom(src => Encoding.ASCII.GetBytes(src.Image)));

cfg.CreateMap<ContactViewModel, Contact>(MemberList.Source)
.EqualityComparison((src, dst) => src.Id == dst.Id)
.ForSourceMember(x => x.IsDeleted, opt => opt.Ignore())
.ForSourceMember(x => x.FullName, opt => opt.Ignore());

Files:

public class ArticleViewModel
{
    public int Id { get; set; }
    ... 
    public List<ImageViewModel> Images { get; set; }
}

public class Article : IEntity<int>
{
    public int Id { get; set; }
    ...
    public virtual ICollection<Image> Images { get; set; }  
}

public class ContactViewModel
{
    public int Id { get; set; }
    ... 
    public ImageViewModel Image { get; set; }
}

public class Contact: IEntity<int>
{
    [Key]
    public int Id { get; set; }

    ...

    public int? ImageId { get; set; }

    public Image Image { get; set; }

}

public class ImageViewModel
{
    public int Id { get; set; }

    public string Image { get; set; }

    public string ImageType { get; set; }

    public bool IsDeleted { get; set; }
}

public class Image : IEntity<int>
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }

    public DateTime Created { get; set; }

    public DateTime Updated { get; set; }

    public byte[] ImageBytes { get; set; }

    public string ImageType { get; set; }

    public int? ArticleId { get; set; }

    public virtual Article Article { get; set; }
}

Answer 1

Finally solved it, I had forgot to mark Image as virtual in Contact. After doing that everything started working out of the box.

public virtual Image Image { get; set; }