When you go into creative, you see that they changed the Main Pack name to WDW. When you choose this, it downloads it like normal. You log out after a day's work.
The next day, it asks you to re-choose the pack.
What happens is that when you choose the WDW pack, it does not save it. It may be that you haven't coded that part in and released this too early. This is really bad feature to have and I wish this gets fixed soon. If you have any questions, comment down below.