[kio] symbol lookup error: /usr/lib/libKF5KIOCore.so.5: undefined symbol: _ZN4KJob14percentChangedEPS_mNS_14QPrivateSignalE

Several users of Manjaro reported an undefined symbol issue after upgrading frameworks from 5.79 to 5.80 series:

• https://forum.manjaro.org/t/testing-update-2021-03-15-kde-frameworks-gnome-grub-vhba-modules-python-haskell/58060/44
• https://forum.manjaro.org/t/kde-could-not-find-theme-after-update/58598
• https://forum.manjaro.org/t/kde-could-not-find-theme-after-update/58598/6

Quote from bwally:

I can manually run GTK apps and the manjaro-settings-manager by starting them from another TTY and exporting DISPLAY to be “:0”, but any KDE/Plasma applications fail with the same error, below is the error when I try to run Dolphin:

dolphin: symbol lookup error: /usr/lib/libKF5KIOCore.so.5: undefined symbol: _ZN4KJob14percentChangedEPS_mNS_14QPrivateSignalE