Epub Table of contents is empty

The table of contents on some epub is missing, even though they work in Apple Books. Using iPadOS 14.4, and MarginNote 3.7

In MarginNote the contents are empty

However in Books they are there (I exported the book out of MN into Books)

Hello

Can I have a look at the Epub file? Thanks!

Kind Regards,
MarginNote-Sushi
Support Team

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