firewall ipv6-address-group

Greetings,

This firewall address group works:

ipv6-address-group cfengine_server {
    description "CFEngine master server"
    ipv6-address 2001:470:1d:a2f::2
}

But this firewall rules fails:

rule 100 {
   description "CFEngine inbound to server"
   action accept
   protocol tcp
   destination {
     group {
     ipv6-address-group cfengine_server
     }
   port 5308
}

I tried tab completion too andthere seemed to be no option for an ipv6 address group:

# set firewall name WAN_IN rule 100 destination group
Possible completions:
address-group Group of addresses
network-group Group of networks
port-group Group of ports


}