EF Core ObservableColection CollectionChanged via HasConversion

Question

I want to notify parent ReportModel when Technicians CollectionChanged. It works when creationg new ReportModel, but when I'm starting editing ReportModel from DB, ObservableCollection is created via HasConversion extension and CollectionChanged isn't fired anymore. Any doubts how to achieve it?

public class ReportModel : ModelBase, IModel
{
private ObservableCollection<ReportPerson> technicians = new();
    
 public ReportModel()
 {
     Technicians.CollectionChanged += Technicians_CollectionChanged;
 }

 private void Technicians_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
 {
     if (e.NewItems != null)
     {
         foreach (var item in e.NewItems)
         {
             if (item is INotifyPropertyChanged notifyPropertyChanged)
                 notifyPropertyChanged.PropertyChanged += TechNotifyPropertyChanged_PropertyChanged;
         }
     }

     if (e.OldItems != null)
     {
         foreach (var item in e.OldItems)
         {
             if (item is INotifyPropertyChanged notifyPropertyChanged)
                 notifyPropertyChanged.PropertyChanged -= TechNotifyPropertyChanged_PropertyChanged;
         }
     }
     OnPropertyChanged(nameof(Technicians));
 }

 private void TechNotifyPropertyChanged_PropertyChanged(object? sender, PropertyChangedEventArgs e) => OnPropertyChanged(nameof(Technicians));


 [Column(name: "technicians", Order = 50)]
 public ObservableCollection<ReportPerson> Technicians
 {
     get => technicians;
     set
     {
         if (technicians != value)
         {
             if (technicians != null)
             {
                 technicians.CollectionChanged -= Technicians_CollectionChanged;
                 foreach (var tech in technicians)
                 {
                     if (tech is INotifyPropertyChanged notifyPropertyChanged)
                     {
                         notifyPropertyChanged.PropertyChanged -= TechNotifyPropertyChanged_PropertyChanged;
                     }
                 }
             }
             technicians = value;
             if (technicians != null)
             {
                 technicians.CollectionChanged += Technicians_CollectionChanged;
                 foreach (var tech in technicians)
                 {
                     if (tech is INotifyPropertyChanged notifyPropertyChanged)
                     {
                         notifyPropertyChanged.PropertyChanged += TechNotifyPropertyChanged_PropertyChanged;
                     }
                 }
             }
             OnPropertyChanged(nameof(Technicians));
         }
     }
 }
}

 modelBuilder.Entity<ReportModel>().Property(c => c.Technicians).HasConversion(
 v => JsonSerializer.Serialize(v, (JsonSerializerOptions)null),
 v => JsonSerializer.Deserialize<ObservableCollection<ReportPerson>>(v, (JsonSerializerOptions)null));