AfterGet hook is not run for include() function

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I have the following use caseBooks and a collection called Authors which are connected to each other by reference. I then have an AfterGet hook for the Books collection like so:


export function Books_afterGet(item, context) {
 let chaptersCount = item.pageCount / 30;
 item.chapters = chaptersCount;
 return item
}

Now this works fine when I get a book like so:

let book = await wixData.get('Books', someID);
console.log(book.chapters)

but when I fetch it by author reference like this:

let author = await wixData.query('Authors').eq('_id', authorId).include('books').find();

console.log(author.books[0].chapters);

then I get undefined, meaning that the afterGet hook did not run as I would expect it to.

Why is this working like that? How can I query with include and have the afterGet hook running on these objects?