Disabling ProxyCreationEnabled breaks JsonConvert.SerializeObject and quits VS debugging

Question

I'm trying to serialize to json some data from EF6 DB first entities.

The first problem was that I was doing lazy loading, and closed the data context, then I got Context Disposed error when doing JsonConvert.SerializeObject(dataFromEntities).

So I set context.Configuraton.ProxyCreationEnabled = false; so all propreties that are not included are null by default. The problem now is that when i try to serialize, Visual Studio 2019 just quit debuggin and don't give any exception message. I have my code in a try-catch but it don't catch anything.

What I'm doing wrong?

I also tried to disable lazy loading but the result is the same. Here is the code:

using (var oContext = new DBContext.UDCSDesign())
{
   oContext.Configuration.ProxyCreationEnabled = false; //If i remove this line I get Object Disposed error on serialization

   var oFieldDictionaryList = oContext.FieldDictionary
                          .Include(oField => oField.DropdownItem)
                          .ToList();
}

And then:

try{
    string sDocJsonData = JsonConvert.SerializeObject(oFieldDictionaryList, Formatting.None,
                    new JsonSerializerSettings
                    {
                        ReferenceLoopHandling = ReferenceLoopHandling.Serialize
                    });
}
catch (Exception ex){
}