[lapcat]

I think it's the HN API. The problem also affects hnrss.org: https://news.ycombinator.com/item?id=33786127

[dang]

HN's API is fine - most likely hnrss.org uses the HN Search API.

I've contacted Algolia and they're looking into it. More here: https://news.ycombinator.com/item?id=33790811

Edit: they've found the problem and are currently backfilling the missing data. If anyone still experiences trouble with HN Search after (say) 24 hours from now, please let us know at [e-mail].