The thing is Ahnonay is really a complex age that was not intended to be played in a multi-player environment. Keeping Ahnonay & the 4 Spheres in fully working state (going from solo URU:CC to an online shard like Deep Island) is not possible. Most of the age logics are broken.
On Deep Island, you'll never see crabs on Sphere 1 not because someone solved the age before you, but instead because they were so buggy, they are disabled.
On Deep Island, you'll never see ning trees on Sphere 2 (crystal trees) not because someone solved the age before you, but instead because they were so buggy, they are disabled.
You call the ages Ahnonay Cathedral & Ahnonay but that only stands in a MOUL-based shard like MOULa or Gehn.
In Deep Island which is URU:CC-based shard (well some purists might argue...) the ages are called Ahnonay, Sphere 1, Sphere 2, Sphere 3, & Sphere 4. URU:CC has been built to be a standalone solo game. Those ages are unique, they cannot be instanced. There cannot be Annabelle's Ahnonay or Miraak's Ahnonay, there's only: Ahnonay, Sphere 1, Sphere 2, Sphere 3, & Sphere 4. Therefore they are "de facto" public instances.
You cannot use the command /resetage! in ages created by Cyan, it will give you a message error.
You can still pretty much enjoy the Path of the Shell Journey there even thought you don't see the crabs & the ning trees. If you want the full experience, play solo on URU:CC. On MOUL-based shard, the Path of the Shell Journey is not as amazing as on URU:CC.
And theoretically, if you can play on Deep Island, you own a copy of URU:CC.