So, there is a bit of an issue regarding the map as of now.
Minecraft was officially updated to 1.13 today, and they have introduced a feature which will allow you to optimize and update your world to the new version.
Unfortunately, this isn't currently working for the island.
Whenever you spawn, you will be dropped into an endless ocean, where you should be dropped on a beach. Attempts to "optimize" the map through the separate feature without booting into the world have failed.
I'll be looking into this further for a fix and I'll update the link once I know what's up. If anyone has a solution, please let me know. Thank you all!