Dolphin, System Settings, Konsole and KSysGuard icons missing in Kubuntu 20.04 (KDE)

Title. I can't recall when this problem first occurred. Both icons in Task Manager and Start Menu, as well as the icons inside the apps themselves simply don't appear. The apps work, however the icons are just blank.

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Solution 1:

You most probably have selected an icon pack that has not the required icons.