KDE - Duplicate theme in kde desktop settings

On a leap 15.1 VM, I was testing different tuning on ‘system settings’/Workspace/‘Startup and Shutdown’/‘Login Screen’/Theme/Breeze
(Not opensuse breeze theme)
After duplicating the theme whith a new name, I was trying to change the background colour of the theme and add a big icon.

This add a dupplicate theme ‘Breeze’ on ‘system settings’/‘Workspace Theme’/‘Look and Feel’/Breeze.
I could not remove this duplicate theme in that module.

Any comment is welcome.