My father is a non-EU permanent resident in Italy and he's concerned about his PR, since he's waiting for Italian citizenship and the latter is basically necessary for him in order to get this citizenship.
My father fears and thinks that if he moves to another EU country, then he'll have to basically bargain his Italian PR for a temporary one in the other country, and due to that he may lose his Italian citizenship all together, but I'm not sure if he's getting it right, both for the supposed bargain and for the citizenship, because I'm not sure whether
Authorities of a country can ask in return papers issued by an other country
He may not get Italian citizenship if he gives up is PR card (if that's the case), since his dossier is on process and he's satisfied all conditions pertaining to work and residence (there have been some controversies lastly with his case, because Italian administration oververified his case multiple times and they came out with the excuse that he's been unemployed for several years and then his average income went down, but after that I declared my income in order to stabilize things).
The thing is that his citizenship process will surely take too much time, due to the technicalities and ambiguities that the administration processing his application is up to, so can my father settle in this other EU country without giving up his Italian PR? And if that's the case, does he have to ask for a visa or he can simply go and deal with bureaucracy afterwards?