Auditd misses accept syscalls from sshd

Auditd seems to miss accept syscalls from ssh on Ubuntu 14. I tried versions 2.3.2 and 2.4.5 of the daemon with kernel versions 3.13.0-96 and 4.4.0-47. In all cases the accept syscall (43) failed to show up until after I restarted the ssh daemon. It's especially weird because I don't see this problem on Ubuntu 16 (4.4.0-38). Any thoughts about why I am seeing this or where to look? I found a similar question in the archives, but it seems to do with the architecture size and not OS versions: https://www.redhat.com/archives/linux-audit/2015-January/msg00060.html I also posted this question on Stack Overflow: http://stackoverflow.com/questions/40940225/why-does-sshd-accept-syscall-...