UI Lists has some buttons at the bottom related to sorting. One button sorts in alphabetical order, the other reverses sort order. But when both buttons are enabled you don't get reserved alpha. Contrary to what the buttons show, enabling "reversed" turns off alpha sorting so you just get a reversal of the natural order. This button fixes that so you can reverse both natural and alpha sorted lists. Pull Request: https://projects.blender.org/blender/blender/pulls/132578