fstab missing when jail set as template

Hi,

Currently using FreeNAS-11.3-U1. 

Steps to reproduce

1. Create jail either basejail or clone from web ui
2. Add mount point to new jail
3. After successfully startup and turn off again
4. Edit the jail and set it as template in custom properties and save
5. Click again mount points link for the jail and throw below error

When set it to template, the path for the jail changed to /mnt/tank/iocage/templates/