Quote:
Originally Posted by theducks
I would think this is the fault of the (3rd party) Plugin
Sigil is a EPUB2 tool that allows EPUB3. The tool that makes EPUB3 should dot the i's and cross the t's if they are required 
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I assume the OP is referring to this plugin ==>>
https://www.mobileread.com/forums/sho...d.php?t=250566 - have a peek at who wrote it.
BR