Duplicate content

Hi.
Google sent me a letter saying that many duplicates had been found on the site.
I started checking the site and found a serious problem.
Let's say we have an item  page: site.com/category/123-someitem.
Everything is fine, no problems.
But if we enter a truncated URL: site.com/category/123-some, the page will still open with the same content. 
I don't know how such pages get into Google's index. Maybe competitors are doing it, or maybe users mistakenly copy an incomplete address and save it to their bookmarks, but the problem is serious. This is very, very bad for SEO.
But the problem doesn't end there.
When we open the truncated URL, the canonical link also points to the truncated address!!! instead of And this further exacerbates the problem.
How can we solve this problem?

hello can you propose a real link to see this in live ?
in seo setting did you use remove category or remove item id option ?

micker wrote:

hello can you propose a real link to see this in live ?
in seo setting did you use remove category or remove item id option ?

I made some tests.
I installed clean Joomla 5 and FC master.
This is full URL of item page - mobifile.ru/testcategory/1-testitem
Ok, we have this problem, when in FC settings we choose Skip /item/ in item URLs in SEO tab:


Check this truncated URL -  mobifile.ru/testcategory/1-te


If you select “Skip both (experimental)”, the problem will disappear.
But, we have the same problem for tags. And there is no setting to fix it.

hello i can confirm it and i create issue on github
github.com/FLEXIcontent/flexicontent-cck/issues/1233