iOS 8.4: no audiobook track title in iBook ?!?!?

Dear all

With iOS 8.4, Audiobooks (m4b) moved from the "Music" App to "iBook" App.
Now I find that in iBook App the track title of audiobooks do not appear anymore, as in old "Music" App.

(I ripe my Audiobooks from CDs. every track of an Album has an individual title)

In iBook, the title of the tracks are just shown up as "Title" + number of the track.

Is this the same with you?

If yes, what is the idea of this?

How can I see the track title if my audiobooks again?

Tanks for Help

C.