Since 1.17.2 pluma requires libpeas loader for modules - please include libpeas-loader-python as package requirement.
done! https://koji.fedoraproject.org/koji/buildinfo?buildID=832066 http://pkgs.fedoraproject.org/cgit/rpms/pluma.git/commit/?id=96db3870d0e53eec6658202bdb8cde4ce9c50a39 and for my copr repo https://copr.fedorainfracloud.org/coprs/raveit65/Mate-GTK3/