Gedrag JObject

using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

public class Circulair1 {
    public string Naam => "Ik ben circulair 1";
    public Circulair2 instantieVan2;

    public void ZetInstantieVan2 (Circulair2 inst2) {
        instantieVan2 = inst2;
    }
}

public class Circulair2 {
    public string Naam => "Ik ben circulair 2";
    public Circulair1 instantieVan1;

    public Circulair2(Circulair1 inst1){
        instantieVan1 = inst1;
    }
}

public class Program
{
    public static void Main()
    {
        /* Preparatie */
        Circulair1 Circ1 = new();
        Circulair2 Circ2 = new(Circ1);
        Circ1.ZetInstantieVan2(Circ2);

        /* Circulair zonder instellingen */
        //JObject pogingMetCirculair = JObject.FromObject(Circ1);  //JsonSerializerException: Self referencing loop detected
        //JObject pogingMetCirculair2 = JObject.FromObject(Circ2);

        /* Instellingen */
        var JSS = new JsonSerializer {
            NullValueHandling = NullValueHandling.Ignore,
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore //,
            //PreserveReferencesHandling = PreserveReferencesHandling.Objects
        };

        /* Circulair met deze instellingen */
        JObject pogingMetSettingsCirculair = JObject.FromObject(Circ1, JSS);
        JObject pogingMetSettingsCirculair2 = JObject.FromObject(Circ2, JSS);


        Console.WriteLine(pogingMetSettingsCirculair.ToString());
        Console.WriteLine(pogingMetSettingsCirculair2.ToString());
        /*  -- Output
            {
                "instantieVan2": {
                    "Naam": "Ik ben circulair 2"
                },
                "Naam": "Ik ben circulair 1"
                }

            {
               "instantieVan1": {
                    "Naam": "Ik ben circulair 1"
                },
                "Naam": "Ik ben circulair 2"
            }

            -- Gedrag
                    Json.NET will ignore objects in reference loops and not serialize them.
                    The first time an object is encountered >>it will be serialized<< as usual but if the object is encountered
                    as a child object of itself the serializer will skip serializing it.
        */

        /* Nieuwe instelling met serialize */
        var JSS2 = new JsonSerializer {
            NullValueHandling = NullValueHandling.Ignore,
            ReferenceLoopHandling = ReferenceLoopHandling.Serialize
        };

        //JObject pogingMetSettingsSerializeCirculair = JObject.FromObject(Circ1, JSS2); // stack overflow
        //JObject pogingMetSettingsSerializeCirculair2 = JObject.FromObject(Circ2, JSS2);
    }
}