To quote an anonymous user, when discussing an abuse filter (these are called "edit filters" on English Wikipedia) set to warn:
If you're adding external links (as both of the edits I mention here do), it does disallow the edit. Trying to save ping-pongs between the edit filter warning page and the CAPTCHA page.
The expected result is quite clear - the anonymous user should be able to save after passing each of the criteria - proving himself to be a human and not a program using the CAPTCHA, and seeing the warning.