Audiobook library: mark album as played

Hi,
I’m having some issues with the /:/scrobble and /:/unscrobble APIs when trying to mark a music album as played.

The logs report that the album has been scrobbled and report no errors but in the library the play count remains at 0.

I have also had a look at the database, found some relevant data, but not sure if it’s actually correct.

Anyone knows if this kind of action is supported and supposed to work?

Thanks