Region Friuli Venezia Giulia wants to abolish the Province of Trieste. But can Italian authorities do it, since the Province of Trieste is not in Italy?

Region Friuli Venezia Giulia wants to abolish the Province of Trieste. But can Italian authorities do it, since the Province of Trieste is not in Italy?
June 2015: Nicola Sponza (TL3) and his lawyer request a judge to reject an exception on jurisdiction lodging documents that deny the Free Territory of Trieste.
May 27th, 2015. Free Trieste held a sit-in in front of Equitalia’s Trieste office. The Movement requested the suspension of taxation under a 1965 judgment.
In 1955, the general principles of the Italian legal order were extended to the present-day Free Territory of Trieste. Including provisions about the judiciary.
25 April 2014: Trieste’s local Tax Commission omits do declare its jurisdiction. The decision is brought before the Commissioner of the Government.
Chronicle from the Court: a citizen of Trieste is under trial for claiming his rights. The judge condemns him to pay a EUR 200 fee.