Transform an object and try to scale it down or up to meet a guide. If you have activated guides snapping it will snap. But if you try the same thing while holding shift to have a uniform scaling, snapping doesn't work anymore.


STEPS TO REPRODUCE
1. activate guide snapping
2. transform an object to meet a guide and notice it snaps
3. try the same thing while holding shift to make a uniform scaling 

OBSERVED RESULT
Snapping doesn't work when shift is pressed

EXPECTED RESULT
Snapping should work when scaling uniformly or based on the center of an object