iOS 12 Books not showing edited audiobook track names

[euphonium]

Hello,

 

I'm not sure not sure if this is new with iOS 12 and the latest iTunes. Got a new audiobook in m4b. Normally I can edit the title/chapter names of each track and it shows up fine in Books. With this one, it doesn't. Haven't tried this in a while so perhaps it's a new bug. Or if there's some other metadata editor for m4b that could fix it; perhaps iTunes no longer writes the changes to the file?