Container bridge interfaces do not have a link-local address
set container network NET02 prefix '2001:db8:5656::/64
Check:
vyos@r14:~$ ip a list dev pod-NET02 13: pod-NET02: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 26:97:ad:12:28:b5 brd ff:ff:ff:ff:ff:ff inet6 2001:db8:5656::1/64 scope global valid_lft forever preferred_lft forever vyos@r14:~$