Newspapers in northern Italy (where Fincantieri is the hometown business and they follow the progress of each new ship from the time it is ordered until it is delivered) are reporting there's trouble with Carnival Horizon.
It is in the Marghera yard, near Venice, which is and ultra-environmentally-sensitive area anyway. Very basically, the paint is not sticking to the hull, and flakes of the paint, which is filled with all sorts of nasty chemicals, are coming off and polluting the water.
The complete story appeared in the March 20 edition of Cruise News Daily.