For what it may be worth, I tried installing different versions of calibre portable and the Kobo Utilities plugin. The issue seems to have started between 2.23.0 and 2.24.0 (the backup from 2.23.0 shows deflate as the compression method while 2.24.0/1 show store as the compression method. calibre version from 8.5.0 to 8.8.0 does not seem to make any difference.
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