Not sure if that´s a bug:
If you crop a picture e.g. with two faces and after cropping, there is only one face visible. Smart lighting still recognizes two faces. Makes no sense to me.
Therefore I think DXO takes no care of the cropped pictures, it always considers the full image, also for other automatic functions like micro contrast.
The question is now, maybe the result of smart lighting will be different if DxO takes only care of the cropped image. As I wrote, it might be the same thing with other automatic functions.