The category.py bot is adding @@ garbage characters into articles seemingly at random. Here is an example diff:
It seems to do it when the last category on a page is deleted. This happens in userspace, article space, and everywhere else. I grepped the source code for @@ and found two occurrences of it in some interwiki code in wikipedia.py, where it is used as a "marker" or something. I'm not sure how it's ending up getting inserted in text. I'm unfamiliar with this section of the bot, so could someone who is familiar with it please take a look?
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