I am using Manjaro Linux with KDE Plasma 5.22.3, Frameworks 5.84.0

I am trying to use Newaita Icon theme, when I copy it to the '/usr/share/icons' folder, and apply it, some icons are missing.
It used to be folder icons, now some application icons, some categories in the system settings and some file types.

However, I once installed Gnome and Installed the theme on it, then moved to KDE and it worked flawlessly.

I used 'gtk-update-icon-cache' but without any success.
Any one having a similar issue ?