1628.A public institution whose board of directors, on the day before the day of amalgamation, administered a grouped institution under the first paragraph of section 5 of the Act to modify the organization and governance of the health and social services network, in particular by abolishing the regional agencies (chapter O-7.2), is deemed, as of the day of amalgamation, to have been determined by the Minister under section 328 of this Act as being the public institution to which the grouped institution is attached.