Immigration will be in Lisbon as it is the first entry into the EU. Lisbon to Venice is essentially a Domestic flight as it is wholly inside the Schengen region of the EU.
I got an E-mail this morning from Carnival saying the same thing. Looks like the hole Carnival group is doing this.
Did someone bring back mask mandates inside in one of the states?
I was looking at the same Itinerary. It's on Symphony. I was wondering if they had just not taken down the Rome sailings yet, but this makes more sense. Glad I booked the Barcelona one! Thanks.