I checked this other question and I have a problem navigating through dialog boxes that is not answered there.
I'm copying + pasting folders and when the dialog "Stop/Replace/Merge" appears I can't navigate with the TAB because the dialog box never gets focus.
If I click on the dialog box then I can tab between the buttons, but that defeats the point of using the keyboard and slows me down (I have several folders to paste in different locations).
Is this a bug? I do have "Full Keyboard Access" turned on. I also checked this question and nothing there helps me. I already updated to Mojave.