I have a couple of tag RSS feeds set up across multiple sites, and apparently starting on January 2nd, occasionally the feeds are fetching data for a completely different tag.

For example, on January 2nd, the tag feed (https://stackoverflow.com/feeds/tag?tagnames=cics&sort=newest) fetched a number of questions tagged with . An hour or so ago, the (https://serverfault.com/feeds/tag?tagnames=zos&sort=newest) tag fetched a number of questions tagged with as well. This isn't repeatable, exactly, because when I've fetched the tag manually, the resulting XML doesn't have any of these questions in them, but they show up in my feed reader.

This seems to have been happening since Jan 2023, and has also been reported at:



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