I’m not sure we saw the Prime universe until the very end. When they arrived at the house the first time, in the previous episode, Shelby had already jumped multiple times. The universe had already been altered. In that altered reality, we see Bryan say that he likes the sea. In the end, when the twins are reunited and the universe reset, Bryan loves the ocean. Not a holdover, just the first time we’re seeing the Prime version of that scene. Of course your interpretation works too.