Where, by an act concluded after the opening of insolvency proceedings, a debtor disposes, for consideration, of:
(a) an immoveable asset;
(b) a ship or an aircraft subject to registration in a public register; or
(c) securities the existence of which requires registration in a register laid down by law;
the validity of that act shall be governed by the law of the State within the territory of which the immoveable asset is situated or under the authority of which the register is kept.