Sorry, this has been changed in the new version to follow the extensions making rules. Now it will be this:
Extension files from "shredder" folder should be extracted to phpBB's /ext/shredder/ folder.
ad posted above by HiFiKabin - viewtopic.php?f=456&t=2269621&start=30#p13973681
Volksdevil wrote:Hi mate,
I can't believe I've only just noticed this but...Is it possible to generate the actual canonical links in the sitemap?
It's SEO mistake that Canonical url does not match with page url as in the default phpBB 3.1. There are two ways to solve this problem:
1) SEO Topic & Canonical URL
2) Wait when it will be fixed by phpBB developers (this is unreal IMHO).