auto-redirect: Let fw4 take precedence over prerouting

route/router.go

@@ -338,6 +338,7 @@ func NewRouter(
 				_ = router.interfaceFinder.Update()
 			})
 			interfaceMonitor, err := tun.NewDefaultInterfaceMonitor(router.networkMonitor, router.logger, tun.DefaultInterfaceMonitorOptions{
+				InterfaceFinder:       router.interfaceFinder,
 				OverrideAndroidVPN:    options.OverrideAndroidVPN,
 				UnderNetworkExtension: platformInterface != nil && platformInterface.UnderNetworkExtension(),
 			})