I've installed some themes, for example "KFaenza New" ( https://store.kde.org/p/1233451/ ) or "Suru++ Dark" ( https://store.kde.org/p/1245808/ ) If I start an app with those themes applied, I see in console something like >Icon theme "faenza" not found. >Icon theme "suru" not found. I'm not sure if I really need them, but they pointed in index.theme files in form of "Inherits=breeze,faenza,oxygen,suru,hicolor" And I can see it only if I open index.theme file from icon pack archive. I think, something should be done with inheritance of icon themes and with theme packs dependencies in general. See also Bug 367920
Can reproduce with KFaenze New icon theme, Suru++ is not displayed in KCM after install (unpacking master.zip archive in .local/share/icons/ folder start showing Suru++ in KCM and displays many errors in console). Launching app with Numarceeze icon theme shows 'Icon theme "Papirus-Dark" not found.' in console. Operating System: Netrunner Rolling KDE Plasma Version: 5.13.5 Qt Version: 5.11.2 KDE Frameworks Version: 5.50.0
*** This bug has been marked as a duplicate of bug 367920 ***