Drag a tab to Favorites: it disappears from its tile while you’re dragging and then comes back when you drop; the disappearance seems premature. This is true for no matter where you drag it to. It shouldn't disappear from its initial place until you've actually dropped it somewhere. It's sufficient to see the blue shaded rectangle of where it's going to be dropped to know that you're in the process of moving it. But having it disappear and then reappear when you drag to Favorites is strange.
