It looks like there's something wrong with the description for as-path-prepend, origin, and community on 1.4 (but not 1.3):
trae@cr01a-vyos# set rule 20 set Possible completions: > aggregator Border Gateway Protocol (BGP) aggregator attribute as-path-exclude Remove ASN(s) from a Border Gateway Protocol (BGP) AS-path attribute as-path-prepend as-path-prepend_help atomic-aggregate Border Gateway Protocol (BGP) atomic aggregate attribute bgp-extcommunity-rt Set route target value > comm-list Border Gateway Protocol (BGP) communities matching a community-list community community_help distance Locally significant administrative distance extcommunity-rt Set route target value extcommunity-soo Set Site of Origin value ip-next-hop Nexthop IP address > ipv6-next-hop Nexthop IPv6 address large-community Set BGP large community value local-preference Border Gateway Protocol (BGP) local preference attribute metric Destination routing protocol metric metric-type Open Shortest Path First (OSPF) external metric-type origin origin_help originator-id Border Gateway Protocol (BGP) originator ID attribute src Source address for route table Set prefixes to table tag Tag value for routing protocol weight Border Gateway Protocol (BGP) weight attribute [edit policy route-map BGP-BACKBONE-IN]