Yes, that's expected. You can mount it again by setting the 'Automount' switch on, detach the disk, then reattach the disk. It will auto mount. The 'Udev' marker is only on the mount button and doesn't affect auto mount. I'll have it fixed in the next release of UD. Because of some users whinning about too many updates, I'll hold off until it becomes a necessity to update. Right now you have a work around.