C# Scripting: Base interfaces' method can not be called in Globals object

[pongba]

Version Used:
Latest

Steps to Reproduce:
Define the Globals type as such:

public interface IGlobals
{
    bool Foo();
}

public interface IGlobals2 : IGlobals
{
    bool Bar();
}

Now create the script with IGlobals2 as the injected global object type:

CSharpScript.Create<int>("Foo();", globalsType: typeof(IGlobals2),...);

Expected Behavior:
script should compile and work.

Actual Behavior:
error CS0120: An object reference is required for the non-static field, method, or property 'IGlobals.Foo'

However, if instead we use class inheritence, it will work:

public class Globals
{
    public void Foo() { }
}
public class Globals2 : public Globals
{
    public void Bar() { }
}

CSharpScript.Create<int>("Foo();", globalsType: typeof(Globals2),...);

[pongba]

@jinujoseph is this confirmed a bug or an expected behavior?