ip settings not work for jail 'service' type

[Subbsd]

Hi

Jail configuration with "complete” works perfectly with IP4, IP6 and
their secondary.
But if try jailed 'service' - it does not work. For example:

1) have uncomment:
ftp     stream  tcp     nowait  root    /usr/libexec/ftpd       ftpd -l

2) have jail cfg like:
jail_enable="YES"
jail_list="example"             # Space separated list of names of jails
jail_example_rootdir="/"
jail_example_hostname="${hostname}"
jail_example_interface="lo0"
jail_example_ip="192.0.2.10"
#jail_example_ip_multi0="10.0.0.1" # secondary - shouldn't work?
sockstat show *:21
jail_example_exec_start="service inetd onestart"
jail_example_exec_stop="service inetd onestop"

3)
service jail start example

4)
ftp 192.0.2.10
(no connection)

I somewhere was mistaken or it shouldn't work? Thanks