I don’t understand why it isn’t mapping….PostgreSQL….Please help me who can….

It always returns an empty object in join and value objects

I have a little experience with dapper but i haven’t time for deep learning

public async Task<IEnumerable<Doctor>> Search(DoctorFilter filter)
    {
        await using var connection = new NpgsqlConnection(connectionString);
        await connection.OpenAsync();

        var query = BuildSearchParameters(filter, out var parameters);

        var doctors = await connection.QueryAsync<Doctor, Specialization, Clinic, Doctor>(
            query,
            (doctor, specialization, clinic) =>
            {
                doctor.Specialization = specialization;
                if (clinic != null)
                {
                    doctor.Clinics.Add(clinic);
                }
                return doctor;
            },
            parameters,
            splitOn: "SpecializationId, ClinicId"
        );
        return doctors;
    }

public class Doctor : Entity
{
    public Doctor()
    {
        Clinics = new List<Clinic>();
    }

    public Guid SpecializationId { get; set; }
    public Specialization Specialization { get; set; }
    public Qualification Qualification { get; set; }
    public int Experience { get; set; }
    public Guid? UserId { get; set; }
    public User User { get; set; }
    public FullName FullName { get; set; }
    public List<Clinic> Clinics { get; set; }
}

namespace MedRaise.Domain.Entities;

public class Specialization : Entity
{
    public string Name { get; set; }
}

using MedRaise.Domain.ValueObjects;

namespace MedRaise.Domain.Entities;

public class Clinic : Entity
{
    public Clinic() {}
    public Clinic(string name, Address address, ContactInformation contactInformation)
    {
        Name = name;
        Address = address;
        ContactInformation = contactInformation;
        Doctors = new List<Doctor>();
    }

    public string Name { get; set; }
    public Address Address { get; set; }
    public ContactInformation ContactInformation { get; set; }
    public List<Doctor> Doctors { get; set; }
}

I don’t understand how to solve this problem, I’ve already tried changing SplitOn and all sorts of advice from chat and internet and nothing helped