Routes do not set the Flags field correctly

[fs185143]

I have a route (via /proc/net/route):

Iface   Destination     Gateway         Flags   RefCnt  Use     Metric  Mask            MTU     Window  IRTT                                                       
eth0    00000000        014014AC        0003    0       0       0       00000000        0       0       0                                                                               

but if I do

link, err := netlink.LinkByName("eth0")
if err != nil {
  return err
}
routeList, err := netlink.RouteList(link, unix.AF_INET)
if err != nil {
  return err
}

then the route returned has route.Flags=0, when it should be 3. I have verified that the rest of the details match the above route, but the flags are not retrieved correctly.

This is on version v1.3.0.