There’s this similar (but not the same) bug from long time ago:
But I’m not sure about it, since each computer has its own configuration for the shadows, there are computers than can’t apply the AO and others that have good graphics.
Maybe this could be moved to suggestions. I’m not sure if the light is meant to be shown in situations like in your image or not.
Or, we could page @not_owen_wilson to ask him whether the improvements you suggest are planned ( / will be revisited) for the long term or if the current implementation is here to stay.