I had already set up all my FP+ times a few weeks ago, and just got a notice yesterday that my Dinosaur FP+ for 11/12 was automatically changed to Primeval Whirl. Sure enough, I can’t make any FP+ for Dinosaur for the whole time of the trip.
Dinosaur is shown to be on Refurb until 10/17, but I suspect that this means the refurb has been extended (again.)