Binding.bindContentBidirectional not work

I have a JavaFX controller in which I modeled the CRUD operations that can be done on a Doctors table, insert, delete, read and modify. In another controller I manage the patient data and in a comboBox I show the list of doctors. I would like to make this comboBox dynamic, i.e. I would like its values ​​to update every time I perform a CRUD operation on the other controller. I wrote this code:

DOCTOR CONTROLLER

public class MedicoController extends SplitPane {

private ObservableList<Medico> listaMedici;

public MedicoController(){
    listaMedici = FXCollections.observableArrayList();
}



@FXML
public void clickOnButtonInserisci(){
     Medico medico = Medico.builder().build();
     //INSERT ON DB
     Long res = mediciDao.inserisciMedico(medico);
     listaMedici.add(medico);
}

public ObservableList<Medico> getListaMedici() {
        return listaMedici;
}

}

PATIENTS CONTROLLER

public class DipendentiCreaController extends SplitPane{


@FXML
private ComboBox<Medico> comboBoxMedico;

private ObservableList<Medico> listaMedici;

private MedicoController medicoController;


public DipendentiCreaController(){
    listaMedici = FXCollections.observableArrayList();
}

public void init(){
    comboBoxMedico.setItems(listaMedici);
    Bindings.bindContentBidirectional(listaMedici, medicoController.getListaMedici());
}


}

After entering a doctor in the database The comboBox in the patient controller is empty. What am I doing wrong? thank you