I got this strange error, see attachment, and I was wondering is it a bug. Error shows up for some of my ebooks but for some it doesn't. At first, I was thinking is there something wrong with my way to zip my ebooks but I have used the same workflow for all my ebooks. Why this error shows up for some of my books and not all of them? For me, it looks like it's a bug because OEBPS folder isn't required in the OPF manifest as you know.
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