How to verify property of fake which was cast to object?

Hi,

I am trying to test if property (List of Field(s)) was initialized correctly in constructor. However I cannot access this property directly, only via method, which cast Field to object. 

I think, because of the cast, I got back "TypeMock.TypeMockException: ***Cannot verify on real object -use a fake object instead" when trying to verify property was set / not set.

Please see the code example below:

(example should be executable)

class Field
{
    public string Name { get; set; }

    public string Description { get; set; }

    private int? _value;

    public int? Value
    {
        set => _value = value;
    }
}

class FieldSection
{
    private List<Field> Fields { get; }

    public FieldSection(IDictionary<string, int> fieldValues)
    {
        Fields = new List<Field>();

        foreach (var value in fieldValues)
        {
            if ((value.Value % 2) == 0)
            {
                Fields.Add(new Field { Name = value.Key });
            }
            else
            {
                Fields.Add(new Field { Name = value.Key, Value = value.Value }); 
            }
        }
    }

    public List<object> GetAvailableFields()
    {
        return Fields.Select(field => (object) field).ToList();
    }
}

[Test]
public void Test2()
{

    var fieldValues = new Dictionary<string, int> { {\"field1\", 1}, {\"field2\", 2} };

    // fake future objects, which gets created in FieldSection constructor
    var fakeField1 = Isolate.Fake.NextInstance<Field>();
    fakeField1.Description = \"FakeField1\";

    var fakeField2 = Isolate.Fake.NextInstance<Field>();
    fakeField2.Description = \"FakeField2\";

    var fieldSection = new FieldSection(fieldValues);

    // get back fakes via GetAvailableFields(), which cast fakes to objects
    var availableFields = fieldSection.GetAvailableFields();
    
    // verify Field objects were created correctly
    foreach (Field field in availableFields)
    {
        var fieldValue = fieldValues[field.Name];

        if ((fieldValue % 2) == 0)
        {
            Isolate.Verify.WasNotCalled(() => field.Value = fieldValue);
        }
        else
        {
            // here comes the error: TypeMock.TypeMockException : ***Cannot verify on real object -use a fake object instead
            Isolate.Verify.WasCalledWithExactArguments(() => field.Value = fieldValue);
        }
    }
}

How can I cast field from availableFields back to Typemock fake object, so I will not get an error?