<link rel="canonical"> no longer holds canonical URL, but just the URL used to access the page. Examples:
- https://en.wikipedia.org/wiki/Page produces <link rel="canonical" href="https://en.wikipedia.org/wiki/Page" />
- https://en.wikipedia.org/wiki/Page?blah produces <link rel="canonical" href="https://en.wikipedia.org/wiki/Page?blah" />
- https://en.wikipedia.org/?title=Page produces <link rel="canonical" href="https://en.wikipedia.org/?title=Page" />
and so on.