Unwanted gobble/garble of links

[mcdemarco]

In a long paragraph of links, three adjacent links were merged into one bad link, while several others were processed correctly.

Here is my markdown:
Jacinyth City is a 1--3 player game based on P.D. Magnus' [Jacynth](https://boardgamegeek.com/boardgame/39290/jacynth) and Andrew Looney's [Zark City](https://boardgamegeek.com/boardgame/35003/zark-city) (a simpler [Zarcana](https://boardgamegeek.com/boardgame/10996/zarcana)-style game for a traditional deck of cards). I devised it after a discussion on my [geeklist of Zarcana-type games](https://boardgamegeek.com/geeklist/333402/arcana). I've also made a more Zark City-like Decktet game, [Deck Town](http://mcdemarco.net/games/decktet/decktown/), [deciphered](http://mcdemarco.net/games/decktet/dectana/) [Dectana](https://boardgamegeek.com/boardgame/60015/dectana), and am playtesting yet another Zarcana-type game for the Decktet.

Here is what markdown_to_BGG did to it (merged the external link text from Deck Town and the internal BGG location of Dectana into a single, incorrect link, completely deleting the external link between them):
Jacinyth City is a 1--3 player game based on P.D. Magnus' [boardgame=39290]Jacynth[/boardgame] and Andrew Looney's [boardgame=35003]Zark City[/boardgame] (a simpler [boardgame=10996]Zarcana[/boardgame]-style game for a traditional deck of cards). I devised it after a discussion on my [geeklist=333402]geeklist of Zarcana-type games[/geeklist]. I've also made a more Zark City-like Decktet game, [boardgame=60015]Deck Town[/boardgame], and am playtesting yet another Zarcana-type game for the Decktet.

I ran the text directly through marko to see if it was the source of the munging, but that came out fine:
<p>Jacinyth City is a 1--3 player game based on P.D. Magnus' <a href="https://boardgamegeek.com/boardgame/39290/jacynth">Jacynth</a> and Andrew Looney's <a href="https://boardgamegeek.com/boardgame/35003/zark-city">Zark City</a> (a simpler <a href="https://boardgamegeek.com/boardgame/10996/zarcana">Zarcana</a>-style game for a traditional deck of cards). I devised it after a discussion on my <a href="https://boardgamegeek.com/geeklist/333402/arcana">geeklist of Zarcana-type games</a>. I've also made a more Zark City-like Decktet game, <a href="http://mcdemarco.net/games/decktet/decktown/">Deck Town</a>, <a href="http://mcdemarco.net/games/decktet/dectana/">deciphered</a> <a href="https://boardgamegeek.com/boardgame/60015/dectana">Dectana</a>, and am playtesting yet another Zarcana-type game for the Decktet.</p>

I'd guess there's some greedy regex in there somewhere.