Siri Knowledge not working on iPhone, but works on iPad.

Hello Apple Community Helpers,

All the time, I thought Siri Knowledge was exclusive to PadOS or MacOS. Yesterday I found that iPhone did support Siri Knowledge in Spotlight Search. On my iPad, when I type the names of actors/actresses, movies, TV shows, etc, the search result contains abundant information, including a "Siri Knowledge" part in which there are facts of what I want to search, and even links to Spotify, IMDB, Rotten Tomatoes (when I searched for a movie, for example), etc.

When I did the same thing on my iPhone, the results were very limited. For example, when I searched for "Al Pacino", the results suggested I search this keyword in Safari, podcast and app store, while iPad gave adequate info about him, and I could directly see his age, nationality, brief introduction, images, and access pages about him in links to Wikipedia and IMDB.

After finding that this function is not exclusive, at first, I thought it had something to do with the settings of Siri & Search. I switched on all the options of Siri and Search, and didn't work. My 14 Pro Max also has been updated to the newest iOS17 version.

How can I address this issue?