I agree, that is too tight a connection. What if your plane into Venice is late and you miss the transfer to Cortina? It is quite possible—-travel arrangements are not wholly reliable these days. Many of us who have traveled to Europe recently have faces issues—-schedule changes, canceled or delayed flights, strikes . . . . all fairly common.
As an example, we went to Italy for a month this spring. Our British Airways flight from Seattle tomLondon left on time and touched down on time. But then we had to wait on the tarmac for a gate to open up. When one did, we had to wait for airport staff to come and operate the jetway that connects to the plane. Then we deplaned and walked through the tube into the terminal, only to find a locked glass door. So we had to wait for someone to notice our waving and whistling, and open the door. All of this due to staffing shortages.
As a result we an hour late getting off the plane, cutting into our time to transfer to our connecting flight to Rome. Fortunately it departed from the same terminal (T5), the lines at security were not bad and . . . The Rome flight was itself running late. So we made it.
Our return flight from London back to the US was nearly 4 hours late departing, due to a “Maintenance issue” with the plane, and the lack of a second pilot. If you happen to be flying on an A380:watch out—-they have been having lots of problems, leading to delays and canceled flights.
It would be much safer to fly in to Venice one day early so you have a buffer in case of problems. And if there are none, count yourselves lucky and enjoy a night in Venice.