On the dimensions of an object you can constrain the height and width so that if one changes the other proportionately does so. When these objects are in an auto layout, however, this constraint isn’t respected and the width and height won’t maintain the same aspect ratio. If the object is set to fill horizontally or fill vertically, it won’t scale properly.
I’d like the constraint set on the layers panel to be respected when objects resize in an auto-layout.