(seen while attempting to emerge kde-meta)

  (sci-chemistry/chemical-mime-data-0.1.94-r3:0/0::science-kit, ebuild scheduled for merge) pulled in by
    sci-chemistry/chemical-mime-data required by (kde-apps/kalzium-22.08.1:5/5::kde-kit, ebuild scheduled for merge) USE="handbook -debug -editor -solver"  (sys-apps/fwupd-1.7.7:0/0::core-hw-kit, installed) pulled in by
    >=sys-apps/fwupd-1.0.3 required by (gnome-extra/gnome-software-3.36.1:0/0::gnome-kit, installed) USE="firmware flatpak gnome spell udev -gtk-doc (-packagekit)"
    sys-apps/fwupd required by @selected 
{{}}

Further investigation revealed some obscure side-effect at play with that package (hence the reason r3 was blocked upstream in gentoo):

https://bugs.gentoo.org/701900

and indeed, funtoo is still pointing to r3

https://github.com/funtoo/science-kit/tree/next/sci-chemistry/chemical-mime-data

So the fix appears to be to integrate this commit

I expect all these packages to be affected as side-effect:

• kde-apps/kde-meta
• kde-apps/kde-apps-meta
• kde-apps/kdeedu-meta
• kde-apps/kalzium (if fwupd is installed, which is typically yes)