I'm using ifwatchd(8) to switch machines to use interfaces on a backup
switch should the main switch fail.

If I unplug cables on an fxp, everything works as expected.

If I unplug a cable on a bge, ifwatchd doesn't trigger the scripts ...
... until you run ifconfig bge0.

According to documentation, ifwatchd uses messages on the routing socket
and I admit not knowing too much about the routing socket.

Is this a bug in bge(4)?