Different ship, but I developed minor COVID symptoms in the middle of the night just before docking back in Seattle on Quantum of the Seas yesterday. Took an antigen test as soon as I got home, and it came up positive. Feeling like absolute dog poo today, but not nearly as bad as a lot of people have reported.
Despite all the precautions, it's obviously possible for people to test negative before boarding, but still be carriers and spread the virus around the ship. It is what it is, and it won't stop me from cruising.