Google has indexed the original URL and the same URL with ?_debug=1.
I have debug set to false, have for a few months, but Google shows thousands of URLs in their index.
For Google to drop these from their index, I would need XenForo to return a 410 (best case scenario) or a 404.
I could see this being an issue for other sites who have enabled debug mode for any length of time, thus creating duplicate content issues and problems with Google.
Thanks in advance for your help.