incorrect description on firewall group ipv6-network-group ,it should be Firewall ipv6-network-group
vyos@test-firewall# set firewall group
Possible completions:
+> address-group
Firewall address-group
+> ipv6-address-group
Firewall ipv6-address-group
+> ipv6-network-group
Network-group member
+> network-groupit was tested on VyOS 1.4-rolling-202201120317