VyOS has some commands that mirror FRR, but do not work, such as:

admin@vyos1# run show bgp neighbors eth1 received-routes 
% No such neighbor or address family

note that the command without the suffix like received-routes works fine:

admin@vyos1# run show bgp neighbors eth1 
BGP neighbor on eth1: fe80::a8c1:abff:fe34:d427, remote AS 4215003081, local AS 4215003083, external link
  Local Role: undefined
  Remote Role: undefined
...

The correct command would be e.g. show bgp ipv4 neighbors eth1 received-routes (note the additional AFI)

An issue with FRR about the existence of those commands has also been raised:
https://github.com/FRRouting/frr/issues/20457