I just conducted another test.
There were some ebooks I successful converted several years ago with two author names. When I load those files on my Kindle, both names appear. Thus, those files created by Calibre 3 years ago display as intended.
Some of those ebooks were no longer in my Calibre library. I just re-imported them. When I did so, Calibre stripped the second author's name. Specially, both authors' names show up in the "Author(s)" field, but only the first author is in the "Author sort" field. And when I load them on my Kindle only the first author's name appears.
So it's not just the process of converting or exporting ebooks that strips a second author's name; it happens even when I import an old file that had been perfect.
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