Why does my volume adjust bezel not show properly in macOS Catalina? I recently updated to macOS Catalina (10.15.3), and the "volume adjust" bezel that pops up in the center of my screen when I adjust the volume via touch bar no longer looks correct.  Specifically, it is missing the ticks that demarcate the volume level, instead just showing an empty bar.  Other similar bezels (e.g., display brightness) have the same issue.

I have already tried restarting, as well as disabling the bezels entirely and then re-enabling them.  Any other ideas how to fix this?
I think we're facing similar issues. There's no real fix, if you want to run with those settings, but at least you know what is going on.

If you're using the dark appearance (Settings -> General) and enable reduced transparency (Settings -> Accessibility -> Display) you end up in a situation like this.