Hello.
Thank you for your message.
Here are my answers:
In your multilingual site, do you mean that the pages of all languages share the same canonical URL instead of the canonical URL reflecting the translated language?
Yes, that’s exactly what I mean
Does the canonical URL use parameters such as https://wordpress.test/category/uncategorized/page/3/?foo=bar&x=y?
No, I don’t use these parameters in the url.
Do you also have the WPML SEO plugin installed and the WPML SEO glue plugin activated?
We use the latest WPML version, the specific SEO plugin is included.
To fix the canonical Url problem, I can open and save the translation page without WPML, just in the WordPress editor. But it’s not convenient
I hope everything is clear.
Thanks for your help.