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I changed almost all permalinks on my wordpress
Google actually finds both, the old url and the new one; obviously the old is redirected to the new one, correctly, BUT, this seems to result in a title and descritpion tag duplication issue according to Google webmaster's tool reports.
If I type something like www.mydomain.com/new-url all goes well, if I type www.mydomain.com/old-url it regularly redirects on the new one, but for google it still exists.
Does this represent a temporary issue or should I fix it in order to avoid penalties?
Why Google still considers the old url as a real page?