Using invert mouse pan option will also inverse scroll depending on distance while holding alt

*Enable Invert Middle Mouse Pan
*Hold Alt and Middle Mouse drag the camera around
*Keep holding Alt and zoom in or out with scroll wheel. At a certain distance scrolled, the camera will start inverse zooming.
Seems like its based on a distance from the object or some kind of maxdistance scrolled from where you started. When releasing Alt key, the scroll returns to normal.

Is this intended or some kind of bug?