Great.
I was a little confused by your explanatory 1st post. Thanks for clearing that up.
As regards other EU work in similar vein, my view is even if there is, so what? No one working EU territory, especially when it's fanfic, has the right to claim exclusivity.
If you licensed a book right from Fox and found out another author had a license for the same thing, you might have cause to complain (to Fox). But that would be a business dispute and nothing to do with audience reception
TC