Hi Enrico,
I don't have an answer for you at the moment, but in general have you blocked/opened your images folder for indexing by bots? Just a thought, probably don't help you in this case, but something you should do anyway (in my opinion).
Let me know if you find out the solution. I've asked some Joomla friends about this one as well so we'll see if they come back with something. Btw, this forum thread is open for the public so you can tweet this url and ask people to reply here if you want. :)
Cheers,
Tess
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