2D/Columbus view and 3D Tileset

@Gabby_Getz
Question: I was checking 3D Tileset rendering on sandcastle with Columbus View and 2D View. It seems 3D Tileset stops rendering when i switch to Columbus view or 2D view. I am not able to figure out the reason. Can anyone help?

I have created sandcastle example for the same. Please refer. Please click on toggle button to zoom to tileset.