bird 2.0.3 does not install multipath route in kernel

We have some multi-path routes that fails to get pushed into the kernel. We are running bird 2.0.3 and kernel 4.14.92+. bird> show route ... Table master4: 10.210.138.3/32 unicast [ospf1 13:24:23.022] E1 (145/1020) [10.210.138.3] via 10.210.138.2 on p1-1-1-1-2 weight 1 via 10.210.138.2 on p1-1-5-1-6 weight 1 ... bird> The bird log has the following warning messages (unclear if it is related): 2019-02-28 13:30:38.343 <WARN> Netlink: Invalid argument What is the expected behaviour for bird here? Install both routes or just one of them? Thanks, Kenth