This later caused a slew of errors with the Jenkins builds.
Please see bug 191019 for related context. The failures started occurring here a few days ago: https://jenkins.freebsd.org/job/FreeBSD_HEAD-tests2/737/
This was fixed in r279123, MFCed to stable/10 as r279348. This change (the one that caused the issue and the followup fix) haven't been merged to stable/9.