Just to close the loop on this, it appears the issue stemmed from some Plex Media Server confusion as to which library “owned” the series in question. In this case, performing a modified version of the Plex Dance (to accommodate for two libraries) resolved the current issue. It’s not clear at this point how the server became confused in the first place and I’ve suggested checking the database for potential corruption. Further monitoring will be necessary to see if the issue occurs again with this series or others.
