The package nfs-utils-2.5.1 installs files at /usr/lib/systemd/system-generators when it should be /lib/systemd/system-generators by bug #625954, when root was moved from /usr to /. Reproducible: Always
On a side-note, gentoo currently patches systemd to also look in /usr/lib for these, but it should still be made to use the eclass reported path.