Rather than showing both halves, the same half appears twice in search

You should look harder, it's not a perfect duplicate. The flavor text is split, and the card image download is correct for each half.

This seems to be the way Gatherer handles it though, check it out by cycling the variations under the card image: http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=9844

Issue with Gatherer data