Same here!
Found the same problem but couldn't make it work in dark mode by doing what you suggested. Light mode works fine and I'll add that the white bar will always be on screens that are not the default ones - meaning, whatever you drag the little white bar on the macOS display arrangement setting (which is the way you set your default screen) the other screens automatically will have white bars when mouse focus is not present and this only happens on macOS dark mode.
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