Native Plugin Interface and VR support

I downloaded the Low-level Native Plugin Interface example for Unity 5.2.0f3 from http://docs.unity3d.com/Manual/NativePluginInterface.html. When I press play it renders fine.

If I then enable "Player Settings->Virtual Reality Supported", the texture updates, but the plug-in rendered triangle no longer appears.

I added OutputDebugString statements from the render plugin and it does seem that we are going into the DoRendering code.

Does this mean that VR mode doesn't support custom rendering plugins or is this just a bug in the sample code?