It probably has been brought up before, but we can’t change a category color when the category style is none anymore, this notice is rendered instead:
You can’t select colors because you have a category style of none.
Currently, we need to change the style to something else, change the color, and reset the style to none.
On another subject, I assume we still need core changes to be able to replace categories and tag icons in the sidebar to follow what’s set in these theme components, right?