Thanks for the details @NateDhaliwal. My hunch is that it’s related to that missing CSS var when light/dark mode is involved, and how it’s compiled via PostCSS. It looks like the browser may be falling back to the light mode background color, which is odd since I can’t reproduce this.
Judging by the screenshots, my fix hadn’t been deployed to your instance yet. It should be deployed there now, so give it another try and let me know if you still notice anything off.