@AlfieEdwards said:
Film incorrectly marked as adult in API but not on page
I was editing the page for the movie TAWN-19, a movie rated 15, and not a porno.
However, when you try to import it to letterboxd, it says it can't import due to being an adult film.
I've checked all the cast and crew and none of them have made porn films in the past,
the movie is not checked as adult on the editing page here on TMDB,
why is it still being refused by letterboxd despite not being an adult film?

The movie is this:
https://www.themoviedb.org/movie/771532-tawn-19
Yes, in the web interface it is marked as adult: false
But I think the problem is in the Letterboxd
In the API Request it is also marked as adult: false
https://api.themoviedb.org/3/movie/771532?api_key=THE_KEY

adult   false
backdrop_path   null
belongs_to_collection   null
budget  0
genres  […]
homepage    "https://www.theactorsworkshopnottingham.com/"
id  771532
imdb_id "tt13251838"
original_language   "en"
original_title  "TAWN-19"

EDIT
It was with parameter video true.
You switched to video false today, 2022-02-13
Letterboxd has a Cache period.
It should take 2 or 3 days to be able to update.