The SceneKit.SCNSceneRenderer.OverlayScene property can not be null (but should be)

[mykyta-bondarenko]

I am working on the original Apple sample and found a difference between the API: I can set null to the
OverlayScene property using swift but can not do it using Xamarin.

Steps to Reproduce

1. Create an instance of SCNView
2. Set not-nullable value to the OverlayScene property
3. Set null to the OverlayScene property

Expected Behavior

I can set null to the property and it will not crush.

Actual Behavior

System.ArgumentNullException has been thrown.

Environment

• https://gist.github.com/mykyta-bondarenko-gl/9ca1e16c1f358a21b25a54165c32464e
• swift

sceneRenderer?.overlaySKScene = nil

• xamarin

this.sceneRenderer.OverlayScene = null;

Build Logs

• https://gist.github.com/mykyta-bondarenko-gl/6c453f577c2c4cca4d6a70bd3326e69d

Example Project

• Link to the Xamarin project
• Link to the original project

[spouliot]

The ObjC documentation does not mention it's nullable

However it's optional on the swift documentation