Supported options for icmpv6 are different in 1.3.X and 1.4.0-rc1.
Some of them are migrated properly in https://github.com/vyos/vyos-1x/blob/current/src/migration-scripts/firewall/6-to-7#L138, but some are missing.
Summary of the options and migrations for icmp and icmpv6:
########### vyos@vyos# set firewall name FOO rule 10 icmp type-name ### 1.3.4: ##### ## Supported in 1.4 ## Migrated in 6-to-7 Possible completions: any No Yes echo-reply (pong) Yes No need destination-unreachable Yes No need network-unreachable No Yes host-unreachable No Yes protocol-unreachable No Yes port-unreachable No Yes fragmentation-needed No Yes source-route-failed No Yes network-unknown No Yes host-unknown No Yes network-prohibited No Yes host-prohibited No Yes TOS-network-unreachable No Yes TOS-host-unreachable No Yes communication-prohibited No Yes host-precedence-violation No Yes precedence-cutoff No Yes source-quench Yes No need redirect Yes No need network-redirect No Yes host-redirect No Yes TOS-network-redirect No Yes TOS-host-redirect No Yes TOS-host-unreachable No Yes echo-request Yes No need ip-header-bad No Yes ping No Yes pong No Yes required-option-missing No Yes time-exceeded Yes No need ttl-exceeded No NO (need to migrate to 'time-exceeded') ttl-zero-during-reassembly No Yes ttl-zero-during-transit No Yes vyos@vyos# set firewall ipv6-name FOO5 rule 10 icmpv6 type ### 1.3.4: ##### ## Supported in 1.4 ## Migrated in 6-to-7 Possible completions: destination-unreachable Yes No need no-route No Yes communication-prohibited No Yes address-unreachable No Yes port-unreachable No Yes packet-too-big Yes No need time-exceeded Yes No need ttl-zero-during-transit No Yes ttl-zero-during-reassembly No Yes parameter-problem Yes No need bad-header No Yes unknown-header-type No Yes unknown-option No Yes echo-request Yes No need ping No Yes echo-reply Yes No need pong No Yes router-solicitation No No (need to migrate to 'nd-router-solicit') router-advertisement No No (need to migrate to 'nd-router-advert') neighbour-solicitation No No (need to migrate to 'nd-neighbor-solicit') neighbour-advertisement No No (need to migrate to 'nd-neighbor-advert') redirect No Yes <0-255> <0-255>/<0-255> [edit] vyos@vyos#