Windows insider Phantomofearth on Twitter (and other platforms such as Bluesky) spotted a dialog window with a dark theme that previously was a light themed dialog even in dark mode.
If you're deleting files or copying files, in windows a small window opens with a progress bar that we all know and somewhat love.
As shown in the Twitter post below the buttons are still light themed, showing that this UI change is still a work in progress.
Microsoft hasn't officially said if they are working on improvements for windows 11 dark mode. It already took 10 years to start working on Dark Mode, but I don’t think it’s coming soon.