On three KDE systems, the following packages were removed during full-upgrade today:
Remove: libkwinglutils9:amd64 (4:5.8.7-2), libkwinxrenderutils9:amd64 (4:5.8.7-2), libkwineffects9:amd64
All three systems rebooted to a clean plasma desktop. The chromium panel icon problem also appears to have been fixed in this upgrade.