Ask HN: Mar. 2 - Craigslist ads no longer indexed by Google?

It looks like for the past day or so, google has no longer been indexing craigslist postings. See these two searches for example:

All postings in the Cars by Owner category over the past week: https://www.google.com/search?q=inurl:cto+-intitle:classifieds+site:craigslist.org&num=20&hl=en&safe=off&tbs=qdr:w,sbd:1

And over the past day: https://www.google.com/search?q=inurl:cto+-intitle:classifieds+site:craigslist.org&num=20&hl=en&safe=off&tbs=qdr:d,sbd:1

Actually, since I first noticed it, it may have been fixed. Note that both searches return results from the past 31 minutes (as of now, 4:18pm PST), but nothing else for the rest of today.

Question is, anyone know what caused this, and more generally, whether these sorts of 'gaps' are common? Given my understanding of how Google works, I can't see how a gap would persist once whatever was preventing scraping was removed. There should still be links from the CL index pages to most of the missing ads from that period, so even if Google was temporarily unable to access them, why wouldn't they be filled in after the fact? Or has it just not happened yet?