SUMMARY The margins in the opaque panel-background.svgz get entirely ignored, as if they don't even exist, in compositor-less opaque panel mode. STEPS TO REPRODUCE 1. Add a margin separator to show margins being recognised 2. Turn off the compositor 3. Check the margins again OBSERVED RESULT Margins are gone now EXPECTED RESULT Margins would remain intact SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: KDE neon 5.21.2 (available in About System) KDE Plasma Version: 5.21.2 KDE Frameworks Version: 5.79.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION
Confirmed.
I just realised this is literally 430622
*** This bug has been marked as a duplicate of bug 430622 ***
Indeed it is!