The two selection styles in studio, outlines and bounding box look different when there is a blur applied in lighting.
Bounding box is blurred however the outline is not unlike everything else such as the dots from the scale tool and even wireframe rendering lines.
This works as expected since the outline is not part of the 3D scene. I’m also not sure what’s a use case to have them blurred?
If you want a different behavior please submit a feature request.