Can't renew featured package when currently featured (message: used up)

[Horizon]

If I set up a featured package like this:

featured-single-listing-package.jpg

It allows a user to select featured and pay to post a new featured listing.

Or if a listing is a standard listing, it allows them to change to featured package using the upgrade/renew button, pay, and have it become a featured listing.

However, if I try and re-feature (add time) to an already featured listing using the upgrade/renew button, I get:

used-up.jpg

which says (used up) if the listing is already featured.

Does this mean you can't renew a featured listing until it expires?

(You can toggle it to a standard listing, save. And then change it to a featured and you don't get the (used up) message.)