Can’t find The Green Lady’s Lost Tome when searching by name

I'm really not sure where to post this. I'm playing in French and I'm trying to find the object won during the Reaper’s Rewards Event called The Green Lady’s Lost Tome. (In French it is named Le livre perdu de la Dame Verte.)
I know it's not in the usual bookshelf, like the other books, but rather in the object catalog. So I went into Build Mode, use the search option to search for an object by name, but I could't find it!
I tried every word in the name, like "livre", "perdu", "dame verte", ... nothing came up!
But when I finally browsed page by page in the object catalog, I found the book in the activities -> misc. section. So, it's there!
I guess it just isn’t indexed in the search engine yet. Has anyone else noticed the same thing in another language version of the game?