reported to gnome team, but the problem is not on Gnome. https://bugzilla.gnome.org/show_bug.cgi?id=779849
Created attachment 108037 [details] screenshot
The QPA for the Gnome platform probably does not look up application-local icons.
*** This bug has been marked as a duplicate of bug 377385 ***
It's not a duplicate. Gnome team said in my bug report that is not its reponsability fix this bug.
Hi Dr. Chapatin That's a pity, but KDE default icon theme (breeze) has one: tools-media-optical-copy (/usr/share/icons/breeze/actions/24/tools-media-optical-copy.svg) to express "Copy Medium". Regards, Leslie Zhai
Created attachment 110912 [details] K3b on Gnome 3.26.2 Mentioned icon is not missing anymore.