Controlling how Text.Json.JsonSerializer serializes an object that implements a generic collection interface

Question

I have encountered a problem serialising an object to JSON.

The object is set up with serialisable fields and properties, but it also implements a generic collection interface:

In a simplified form, it essentially looks like this:

class MyClass : IEnumerable<IMyInterface>
{
  [JsonConstructor] public MyClass {}
  [JsonInclude] public List<MyObj> Entries { get; set; } = new List<MyObj> ();
}

class MyObj : IMyInterface
{ 
  [JsonInclude] public string strValue;
  [JsonIgnore] public bool ExampleProp => false;
}

public interface IMyInterface
{
  string strValue;
  bool ExampleProp { get; }
}  

The problem arises because Text.Json.JsonSerializer.Serialize seems to choose to serialise the MyClass instance as an IEnumerable - thus ending up including the ExampleProp value - rather than as a MyClass object.

I have not been able to identify any way to control this behaviour; my only option seems to be to refactor and eliminate the IEnumerable interface (e.g. bury it in a property or method).

Does anyone know of some way to control how JsonSerializer makes these choices?