I think this issue applies to all series where the individual books are only connected by theme (e.g. the same detective solves multiple cases) but not strongly by contents, or even where there is no connection at all between the books, they just happen to be grouped together (I reported a German series once where this was the case). Seems to me that this should rather be addressed on a global level - what do you think @brandon?
(See also Bug: Yes24 Publisher Series vs. Book Series btw )