Maybe this is why?
Quote:
Hasekura launched the Spice and Wolf novel series with illustrations by Jū Ayakura in 2006. The novels took a break after the 17th volume in 2011, and returned with the 18th volume in 2016. The 24th and latest volume shipped on January 7. Yen Press will publish the 24th novel in North America in August, and is also publishing the manga adaptation
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So...it was never actually finished anyway?? Or is LN content beyond 17 just about the adventures of their kids?