permesso di soggiorno based on old passport

I have permesso di soggiorno based on visa in my old passport. Now i left Italy and changed my passport, while my permesso is still valid. Now I wonder weather when i get back to Italy with new passport (without visa) and permesso based on the old passport will i have any problems? I went also italian embassy they told me since i have active permesso they can't give me a new visa. Could someone please answer?

thanks you,


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