Forced Jailkit update overwrites jail specific configurations
The forced jail update overwrites all files within the jail with the system versions of the files, regardless of alterations that could have been made on jail creation time via plugins. For example configuring sendmail_path in the jails php.ini etc...
jk_update does not touch /etc, since its not probed by default. But the forced update uses jk_init/jk_cp which basically recreates the jail from scratch, without triggering the "shell_user_update event" and therefore is not honoring the function a plugin could provide.
Edited by Zak