I just reread your post and would like to expand a bit. If you look at my examples, this case the books metavalue for "title" is correct. It is long, and in the set the differences in the title are cut off in each case of creating a file name which does not need the "long title" feature of Windows 10. So, the file names for all 35 editions of "The Years Best..." (see above) as constructed by the "save to disk" option are identical. It is not the metadata that is bad, it is the calibre-constructed filename. That doesn't generally matter (although it has tripped up some clean-up programs which compare filenames), but it DOES matter if these ad hoc, constructed names replace the original, albeit long, filename (or names constructed faithful to the metadata) ginned up by Calibre!
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