Dropdown menu doesn't display contents if the parent Canvas sort order is greater than 29999

I ran into an issue today with Dropdown menus. I have a Canvas that I want to make sure is always on top of any other canvas (set to screen space - overlay), so I set the sort order to 32767, which is the max sort order for the canvas. I noticed sometime later that my drop down menus weren't showing the contents of the drop down when you clicked on them. I realized that the contents were being shown, but they were hidden behind everything else on the canvas. When the drop down menu contents...

Dropdown menu doesn't display contents if the parent Canvas sort order is greater than 29999