Sorry, thanks for the clarification (English is not my mother tongue). I made different missions / books and realised, in some case I didn't get the chapter. If I remember correctly, it was The Flameseeker Prophecies and Young Heroes of Tyria.
I know for sure, Shiro's Return never troubled me.
There are no addons installed. Only one thing: I had to switch on an old Windows PC because I have some trouble to start the game in Ubuntu 21 after I updated it from 20.
Yesterday I tried Gates of Kryta HM the third time to have an example, and it wrote the chapter. So today I tried Augury Rock because it can be done quickly, and after the second run through I had the chapter. After, at Divinity Coast, I had the chapter after one attempt.
Either there is a delay for the entries, or it has something to do with the fact that I had already started the two books several times. I only finished 1 or 2 chapters, then I disposed of the books because I needed the space.
I never threw Shiro's Return NM / HM away, because the book is already more than half full.
I will do more missions to test whether the chapters will be entered.