Nested Interface will always be a proxy - even when nullable

[tekook]

So I have a simple interface which I'm parsing from json.
The json file contains optional nested interfaces.
I just noticed that all nested interfaces are always replaced with the Castle Proxy.
Even when the Interface is nullable and even when the default value is set to null.
It even ignores the json value "null" and creates a proxie.

Is there anyway to receive null on a missing nested interface?

Simple example:

public interface ISubSettings {
    string SubTest {get;}
}
public interface ISettings
{
    string Text {get;}
    ISubSettings? Test { get; }
}

Corresponding Json:

{
  "Text": null,
  "Test": null
}

This resolves in iSettings.Text being null, but iSettings.Test will an instance Castle.Proxy.ISubSettingsProxy instead of null.