Steps to reproduce:
- Go to Wikipedia (not Beta labs).
- Open a page
- Set a redirect, e.g., to [[Test]]. Do NOT tick the box to set STATICREDIRECT.
- Save the page.
- Check your diff, and find that STATICREDIRECT has been set anyway.
I couldn't reproduce this on beta labs this morning, so it's probable that the patch already exists and just needs to be ported to the production projects.