Just a question how many zpools do you have? If you have 2 or 3 pools then which pool did you activate the iocage? If you have only one then I have no idea what's going on.
All my manually created jails *iocache upgraded to 11.2.-U7 that worked perfect * disappeared with 11.3 *cant even get it back to 11.2-U7 using saved config - Not happy Jane!!!!