Created attachment 108492 [details] Screenshot Some of the icons used in the new system settings are wrong. The displayed icons are black and white, and not coloured like the others even if an appropriate icon exists. See screenshot for more info.
What icon theme are you using? I see the correct icons using Breeze theme icons in KDE Neon.
I use the standard Breeze icon theme. The problem does not appear with other themes like Papirus.
Breeze has both colorful, as well as monochrome icons. Somewhere it is decided which to use, but this decision should be consistent.
Fixed with the fix for Bug 403258 Also related: Bug 386748 *** This bug has been marked as a duplicate of bug 403258 ***