There is a new volume out: The Emergence of Multiple-Text Manuscripts, edited by A. Bausi, M. Friedrich and M. Maniaci. As most volumes in the series (Studies in Manuscript Cultures) this too is open access.
It seems to be a follow-up of the 2016 programmatic volume One-Volume Libraries: Composite and Multiple-Text Manuscripts (ed. by M. Friedrich and C. Schwarke), which proposed a more rigorous terminology for what were (and still are) usually called ‘miscellaneous’ manuscripts and applied it in a number of cultures.
The current volume offers further case studies on the topic and, much like the previous one, keeps a comparative approach across languages and cultures by putting together contributions on Latin, Greek, Coptic, and Arabic manuscripts, as well as manuscripts from medieval China and from the languages of Jain traditions.
Particularly interesting is the article by Patrick Andrist, “Concepts and Vocabulary for the Analysis of Thematic Codices: The Example of Greek Adversus Iudaeos Books,” which closes the volume and offers further terminological discussion and basically applies in depth and develops upon the theoretical background of the volume La syntaxe du codex: Essai de codicologie structurale, co-authored with P. Canart and M. Maniaci (which I reviewed here).
Have a look!