Btw since you’re using FreeNAS 11.2 I assume this is on a iocage jail right? (via plugin or created manually) but the though just occurred to me that this might still be an old style “warden” jail?
We only supported 11.2, I don’t recall the exact version but at least since 1.15.0, possibly 1.14.x, some users did report being able to run it on 11.0/11.1 for a while (which doesn’t mean it fully works) there more details on why exactly it doens’t even start now, here: Server doesn't restart after 1.15.6.1079 update [Please Update to FreeNAS 11.2 or FreeBSD 11.2 base]
However I am making some assumptions here, and you did say it starts so this is somewhat confusing and the issue might actually not be the same.
That said its worth checking if that is the case, and if not than grab sockstat -l46
