The firmware doesn't specifically read the ISBN from sideloaded books, it just seems to read the first <dc:identifier> item in the .opf file.
For the books I have sideloaded from Calibre it is reading the Calibre identifier instead of the ISBN, I guess because the Calibre identifier comes first in the file. I still have to use the KoboUtilities plugin to add the real ISBN and other publisher related metadata on the second connection.
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