Stable sys-process/vixie-cron-4.1-r14 init script still uses /sbin/runscript instead of /sbin/openrc-run.
This is not true and hasn't been true in over a year. Re-emerge the package. commit a8eb04d483e1e1c786235b7bc35055db1f5b6d62 Author: Austin English <wizardedit@gentoo.org> Date: Wed May 18 01:35:03 2016 -0500 sys-process/vixie-cron: use #!/sbin/openrc-run instead of #!/sbin/runscript
please reinstall, it is #!/sbin/openrc-run