PlayerEditBookEvent::setNewBookMeta does not update meta (or at least lore)

Signing or editing a book triggers the PlayerEditBookEvent (I've checked), but the new book's BookMeta is not updated correctly. At the very least, setting the book's lore does not work.

Steps to reproduce:

1. Use the code below to listen for the event and update lore.
2. Sign or save a book (/give @p writable_book -> right click anywhere -> write something and sign/save the book).
3. The book should show "Lore Test" below the usual text when hovering over the item, but it doesn't.

@EventHandler
public void onPlayerEditBook(PlayerEditBookEvent e) {
  BookMeta meta = e.getNewBookMeta();
  List<String> newLore = new ArrayList<>();
  newLore.add("Lore Test");
  meta.setLore(newLore);
  e.setNewBookMeta(meta);
}