When the world is regenerated or rolled back, everyone in the game gets stuck on an unending loading screen. We ultimately have to close the entire application, we can then see the server in question, but not enter it, and in the player listing we see ourselves. The first time this happened was two-three weeks ago, immediately following the Year of the Varg update. Upon the return of the dedicated servers today, rolling back caused the same issue. There is one dedicated server left, and we are afraid to regenerate the world. The longest we have sat and waited for a the world to load is eight minutes, it is possible that we just have to wait longer, I guess. I hope this feedback is helpful!
Enter a Playstation 4 Klei dedicated server. Hit R3 to bring up a menu. Select the bottom option 'miscellaneous.' Select '(vote)rollback.' alternatively: Enter a Platstation 4 Klei dedicated server. Die. Let the world regenerate. Either of these set of actions will result in a loading screen that will load continually.