Thanks Sarmat
The version is 3.
The .opf contains entries for both files.
<item id="nav" href="../nav.xhtml" media-type="application/xhtml+xml" properties="nav"/>
<item href="toc.ncx" id="ncx" media-type="application/x-dtbncx+xml"/>
Why does it need both.
Also when opening the file in Foliate the navigation does not work but does in e-book viewer.
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