ifconfig bridge1
bridge1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: vpn bridge
ether 58:9c:fc:10:ff:81
inet 172.16.20.2 netmask 0xfffffff8 broadcast 172.16.20.7
id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
member: vnet0.9 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>. -> used by the specific Jail
ifmaxaddr 0 port 11 priority 128 path cost 2000
member: vlan10 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
ifmaxaddr 0 port 5 priority 128 path cost 55
groups: bridge
nd6 options=9<PERFORMNUD,IFDISABLED>
I guess that is the expected outcome.