I'm testing uses of the with_watch_providers attribute of Discover Movies and have found some inconsistencies in what Discover says is available as a watch provider, and what the api for movie watch providers says is available for some of the results.

If I try to find movies with Disney+ (ID 337) as a Watch Provider

https://api.themoviedb.org/3/discover/movie?api_key=MYKEYHERE&with_watch_providers=337&language=en&page=274

One of the movies on the list is "The Mothman Prophecies" (ID 2637)

However if I fetch Watch Providers of 2637:

https://api.themoviedb.org/3/movie/2637/watch/providers?api_key=MYKEYHERE

ID 337 is not found

It appears that if a watch region is not set, I can pull up to 10,000 items - which seems odd as I don't believe Disney+ has ever had this many items - and doesn't seem to match up with the data on JustWatch