It looks like the real culprit isHi,
bird 3.0.1 include this patch: "Netlink: Handle onlink flag on BSD-Netlink"
https://gitlab.nic.cz/labs/bird/-/commit/f9c7861e116ad8dc5e5a2314d0f976bf8c938de0
But this broke FreeBSD build with this error:
sysdep/bsd-netlink/netlink.c:1868:10: error: no member named 'nh' in 'struct ea_list
Regards,
Olivier
https://gitlab.nic.cz/labs/bird/-/commit/5c3eff5645446cddb082130feda8298322f576c2
-- Marek Zarychta