bird (2.0.4) does not install multipath route in kernel

[Arno O]

  This topic was already discussed around March 1st 2019, without having
received a clear outcome.

Now, dealing with ECMP with OSPF in Bird 2.04 on Fedora30, I run in same
problems:

-> multiple next hops to same destination (50.50.50.0/24)  are in the route
table of bird:
bird> sho route
Table master4:
10.10.10.0/24        unicast [OIPv46 13:39:16.979] I (150/10) [10.10.10.1]
dev enp0s3
192.168.122.0/24     unicast [OIPv46 13:46:18.979] E2 (150/10/10000)
[10.10.10.3]
via 10.10.10.3 on enp0s3
50.50.50.0/24        unicast [OIPv46 13:46:18.979] E2 (150/10/100)
[10.10.10.3]
               via 10.10.10.2 on enp0s3 weight 11
               via 10.10.10.3 on enp0s3 weight 11
bird>
[root@localhost ~]#

but kernel route table looks unexpectedly different:
root@localhost ~]# netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt
Iface
10.10.10.0      0.0.0.0         255.255.255.0   U         0 0          0
enp0s3
50.50.50.0      10.10.10.2      255.255.255.0   UG        0 0          0
enp0s3
192.168.122.0   10.10.10.3      255.255.255.0   UG        0 0          0
enp0s3
[root@localhost ~]#

Kernel looks configured correctly (*CONFIG_IP_ROUTE_MULTIPATH=y), etc.etc.*

*Bird config on ECMPed bird router: *protocol ospf OIPv46 {
        tick 2;
        rfc1583compat yes;
        ecmp yes limit 8;
        merge external yes;
  ipv4 {
                import all;
                export all;
};
area 0 {
interface "enp0*" {
# type broadcast; # Detected by default
cost 10; # Interface metric
                        ecmp weight 11;

What is missing either in the bird-config or the kernel part?

Thx

BR
Ar