There is an issue in the metadata for the Two Horizons commentary series that is preventing series link from working properly.
For Two Horizons, the series metadata matches the publication data:
"The Two Horizons Old Testament Commentary", "The Two Horizons New Testament Commentary". Since the series data are different, series link considers them different commentary sets.
Whereas for New International Commentary, the series metadata is "New International Commentary on the Old and New Testament" for both OT and NT, even through the publication data distinguishes the two:
"The New International Commentary on the Old Testament", "The New International Commentary on the New Testament".
This means that series link doesn't work across OT and NT for Two Horizons, whilst it does for NIC.
Can the Two Horizons series metadata be updated to "The Two Horizons Old and New Testament Commentary" (similar to the way NIC was) so that series link will work, please?
I realise that I could do this myself on my copy, but that suffers from the disadvantages that (a) I have to remember to do it again as new volumes are added to the series, (b) everyone who cares about this has to do the same.