That's how it is is programmed to work (though I agree it would be nice not to show up). If the Exile button would show up alone with "bad" cards, it is automatically suppressed. If it would show up with other buttons (like here from Livery), it will show.
OTOH, once you press the Livery button, the Exile button will not come up again.
So it working as it's suppsed to be, but it would of course be nice to not show up at all.