i get all list have tv or movie https://api.themoviedb.org/3/tv/2288/lists?language=en-US&page=1

"id" 8217948 poster_path is null use "id" to get details list v4 https://api.themoviedb.org/4/list/8217948?language=en-US&page=1

in list details have "backdrop_path" "/t15KHp3iNfHVQBNIaqUGW12xQA4.jpg", Why in all list have tv or movie https://api.themoviedb.org/3/tv/2288/lists?language=en-US&page=1 not have "backdrop_path"???