UI scaling creates a "white border" around windows atop main window at 225% scaling

I submitted a case via Backstage, but Backstage does not allow for screenshots to be attached to cases.

I’m running Renoise 3.2.2 on macOS 10.15.6 with HiDPI mode enabled at 225% scaling, and there is a subtle white border atop windows that are atop the main window.