Bundle not showing among film releases

Hello! I was wondering how bundles work. Yesterday I created this bundle: https://www.blu-ray.com/movies/Toy-Story-La-Collezione-dei-4-Film-Blu-ray/408071/ but if I search the releases of any Toy Story film (from 1 to 4) this won't show up in the "Blu-Ray bundles" section. Why? I already set "Master Movie ID" to 0 and "Bundle IDs" to the corresponding 4 IDs . Is there anything else I have to do?