/usr/share/icons/Papirus-Adapta-Nokto/22x22/panel is in papirus-icon-theme 20180401-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/icons/Papirus-Adapta-Nokto/22x22/../../Papirus-Adapta/22x22/panel