ServiceStack AutoQuery not working with Code First approach

Question

I already use ServiceStack OrmLite for querying my database, but now I want to create some CRUD API's myself. I have a separate project where my POCO's are declared with the ServiceStack DataAnnotations.

An example class of my POCO project:

public class DropPosition
{        
    [PrimaryKey, AutoIncrement]
    public long Id { get; set; }
    public int PositionId { get; set; }
    public string PositionBarcode { get; set; }
    public string BoxBarcode { get; set; }
    public int? OrderReference { get; set; }
    public DateTime? StartTime { get; set; }
    public DateTime? EndTime { get; set; }
    public bool ActivateLight { get; set; }

    [Reference]
    public virtual List<WorkOrder> WorkOrders { get; set; } = new List<WorkOrder>();
}

Now I've created a new web project so I can serve my API endpoints using AutoQuery, and extended the POCO class:

public class DropPosition
{        
    [PrimaryKey, AutoIncrement]
    public long Id { get; set; }
    public int PositionId { get; set; }
    public string PositionBarcode { get; set; }
    public string BoxBarcode { get; set; }
    public int? OrderReference { get; set; }
    public DateTime? StartTime { get; set; }
    public DateTime? EndTime { get; set; }
    public bool ActivateLight { get; set; }

    [Reference]
    public virtual List<WorkOrder> WorkOrders { get; set; } = new List<WorkOrder>();
}

[Route("/DropPositions", "GET")]
[Route("/DropPositions/{Id}", "GET")]
public class QueryDropPositions : QueryDb<DropPosition>
{
    public long Id { get; set; }
    public int PositionId { get; set; }
    public string PositionBarcode { get; set; }
    public string BoxBarcode { get; set; }
    public int? OrderReference { get; set; }
    public bool ActivateLight { get; set; }
}

[Route("/DropPositions", "POST")]
public class CreateDropPosition : ICreateDb<DropPosition>, IReturn<DropPosition>
{
    public int PositionId { get; set; }
    public string PositionBarcode { get; set; }
    public string BoxBarcode { get; set; }
    public int? OrderReference { get; set; }
    public DateTime? StartTime { get; set; }
    public DateTime? EndTime { get; set; }
    public bool ActivateLight { get; set; }
}

[Route("/DropPositions/{Id}", "PUT")]
public class UpdateDropPosition : IUpdateDb<DropPosition>, IReturn<DropPosition>
{
    public long Id { get; set; }
    public int PositionId { get; set; }
    public string PositionBarcode { get; set; }
    public string BoxBarcode { get; set; }
    public int? OrderReference { get; set; }
    public DateTime? StartTime { get; set; }
    public DateTime? EndTime { get; set; }
    public bool ActivateLight { get; set; }
}

[Route("/DropPositions/{Id}", "DELETE")]
public class DeleteDropPosition : IDeleteDb<DropPosition>, IReturnVoid
{
    public long Id { get; set; }
}

And then followed the best practice examples like this and referenced my POCO project.

public class AppHost: AppHostBase, IHostingStartup
{
    public AppHost() : base("AutoQuery", typeof(ServiceStackService).Assembly)
    {
    }

    public override void Configure(Container container)
    {
        // configure ServiceStack only IOC, Config & Plugins
        SetConfig(new HostConfig
        {
            DebugMode = true
        });

        // auto query
        Plugins.Add(new AutoQueryFeature
        {
            MaxLimit = 1000,
            //GenerateCrudServices = new GenerateCrudServices
            //{
            //    AutoRegister = true
            //}
        });
    }

    public void Configure(IWebHostBuilder builder)
    {
        builder.Configure(app =>
        {
            if (!HasInit)
            {
                app.UseServiceStack(new AppHost());
            }
        });

        builder.ConfigureServices((context, services) =>
        {
            // ormlite               
            var sorterConnectionFactory = new OrmLiteConnectionFactory(ConnectionStrings.SorterLocal, SqlServerDialect.Provider);

            // unicode              
            sorterConnectionFactory.DialectProvider.GetStringConverter().UseUnicode = true;
          
            // register
            services.AddSingleton<IDbConnectionFactory>(sorterConnectionFactory);

        });
    }
}

But I can't see my new API endpoints using the API explorer... But when I activate the GenerateCrudServices options, I see the auto-generated API endpoints. Did I forgot something? Should I change my code for only using my own declared AutoQuery CRUD API's?

I've tried to follow the example BookingsCrud