I've found an error in epubsana.
This is the original OPF. Look at the fonts.
Code:
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<metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">
<meta content="cover-image" name="cover"/>
<dc:title id="t1">To Defy Fate</dc:title>
<meta property="title-type" refines="#t1">main</meta>
<dc:creator id="creator01">Dayton Ward</dc:creator>
<meta property="role" refines="#creator01" scheme="marc:relators">aut</meta>
<dc:publisher>Pocket Books/Star Trek</dc:publisher>
<dc:identifier id="eisbn">9781668097816</dc:identifier>
<meta property="pageBreakSource">9781668097793</meta>
<dc:language>EN-US</dc:language>
<dc:date>2026-04-28</dc:date>
<meta property="dcterms:modified">2026-04-28T12:00:00Z</meta>
<meta property="schema:accessMode">textual</meta>
<meta property="schema:accessModeSufficient">textual</meta>
<meta property="schema:accessibilityFeature">ARIA</meta>
<meta property="schema:accessibilityFeature">alternativeText</meta>
<meta property="schema:accessibilityFeature">displayTransformability</meta>
<meta property="schema:accessibilityFeature">readingOrder</meta>
<meta property="schema:accessibilityFeature">structuralNavigation</meta>
<meta property="schema:accessibilityFeature">tableOfContents</meta>
<meta property="schema:accessibilityFeature">pageBreakMarkers</meta>
<meta property="schema:accessibilityFeature">pageNavigation</meta>
<meta property="schema:accessibilityHazard">none</meta>
<meta property="schema:accessibilitySummary">A simple complexity publication with images and logos, converted to meet EPUB Accessibility specifications of WCAG-AA level. Blank pages from print have been removed in this ebook, with related page number spans set on the first following in-spine page. Certain front and back matter pages have been adjusted in the reading order sequence from print, with related page references reordered in the page-list order.</meta>
<meta id="conf" property="dcterms:conformsTo">EPUB Accessibility 1.1 - WCAG 2.2 Level AA</meta>
<meta id="certifier" property="a11y:certifiedBy" refines="#conf">Benetech</meta>
<meta property="a11y:certifierCredential" refines="#certifier">https://bornaccessible.org/certification/gca-credential/</meta>
<description xmlns="http://purl.org/dc/elements/1.1/"><B><b>A thrilling new adventure based on the acclaimed TV series <I>Star Trek: Picard</I>!</b></B><BR>2401: Just weeks after defeating a devastating joint attack by rogue Changelings and remnants of the Borg Collective, Starfleet and the Federation face a long period of recovery that requires replacing lost personnel and ships. While touring the <I>U.S.S. Titan</I>-A, which is just beginning an extensive repair-and-refit process that will take nearly a year to complete, newly promoted Captain Seven of Nine and her first officer, Commander Raffi Musiker, experience a bizarre temporal event which renders them both unconscious and sends Seven into a deep coma.<BR> <BR> In the aftermath of this inexplicable attack, Admirals Jean-Luc Picard and Beverly Crusher are surprised by the appearance of Crusher's son, Wesley. Now a Traveler capable of traversing through all of space and time, he warns them that forces he cannot identify are working to disrupt time for unknown and potentially...</description>
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</package>
epubsansa wants to change the media type for the fonts.
Code:
<package xmlns="http://www.idpf.org/2007/opf" unique-identifier="eisbn" version="3.0" xml:lang="en-us">
<metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">
<meta content="cover-image" name="cover"/>
<dc:title id="t1">To Defy Fate</dc:title>
<meta property="title-type" refines="#t1">main</meta>
<dc:creator id="creator01">Dayton Ward</dc:creator>
<meta property="role" refines="#creator01" scheme="marc:relators">aut</meta>
<dc:publisher>Pocket Books/Star Trek</dc:publisher>
<dc:identifier id="eisbn">9781668097816</dc:identifier>
<meta property="pageBreakSource">9781668097793</meta>
<dc:language>EN-US</dc:language>
<dc:date>2026-04-28</dc:date>
<meta property="dcterms:modified">2026-04-28T12:00:00Z</meta>
<meta property="schema:accessMode">textual</meta>
<meta property="schema:accessModeSufficient">textual</meta>
<meta property="schema:accessibilityFeature">ARIA</meta>
<meta property="schema:accessibilityFeature">alternativeText</meta>
<meta property="schema:accessibilityFeature">displayTransformability</meta>
<meta property="schema:accessibilityFeature">readingOrder</meta>
<meta property="schema:accessibilityFeature">structuralNavigation</meta>
<meta property="schema:accessibilityFeature">tableOfContents</meta>
<meta property="schema:accessibilityFeature">pageBreakMarkers</meta>
<meta property="schema:accessibilityFeature">pageNavigation</meta>
<meta property="schema:accessibilityHazard">none</meta>
<meta property="schema:accessibilitySummary">A simple complexity publication with images and logos, converted to meet EPUB Accessibility specifications of WCAG-AA level. Blank pages from print have been removed in this ebook, with related page number spans set on the first following in-spine page. Certain front and back matter pages have been adjusted in the reading order sequence from print, with related page references reordered in the page-list order.</meta>
<meta id="conf" property="dcterms:conformsTo">EPUB Accessibility 1.1 - WCAG 2.2 Level AA</meta>
<meta id="certifier" property="a11y:certifiedBy" refines="#conf">Benetech</meta>
<meta property="a11y:certifierCredential" refines="#certifier">https://bornaccessible.org/certification/gca-credential/</meta>
<description xmlns="http://purl.org/dc/elements/1.1/"><B><b>A thrilling new adventure based on the acclaimed TV series <I>Star Trek: Picard</I>!</b></B><BR>2401: Just weeks after defeating a devastating joint attack by rogue Changelings and remnants of the Borg Collective, Starfleet and the Federation face a long period of recovery that requires replacing lost personnel and ships. While touring the <I>U.S.S. Titan</I>-A, which is just beginning an extensive repair-and-refit process that will take nearly a year to complete, newly promoted Captain Seven of Nine and her first officer, Commander Raffi Musiker, experience a bizarre temporal event which renders them both unconscious and sends Seven into a deep coma.<BR> <BR> In the aftermath of this inexplicable attack, Admirals Jean-Luc Picard and Beverly Crusher are surprised by the appearance of Crusher's son, Wesley. Now a Traveler capable of traversing through all of space and time, he warns them that forces he cannot identify are working to disrupt time for unknown and potentially...</description>
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<item href="e9781668097816/fonts/EBGaramond-Regular.ttf" id="EBGaramond-Regular" media-type="font/otf"/>
<item href="e9781668097816/fonts/EBGaramond-SemiBold.ttf" id="EBGaramond-SemiBold" media-type="font/otf"/>
<item href="e9781668097816/fonts/EBGaramond-SemiBoldItalic.ttf" id="EBGaramond-SemiBoldItalic" media-type="font/otf"/>
<item href="e9781668097816/fonts/Saira_Expanded-Bold.ttf" id="Saira_Expanded-Bold" media-type="font/otf"/>
<item href="e9781668097816/fonts/Saira_Expanded-BoldItalic.ttf" id="Saira_Expanded-BoldItalic" media-type="font/otf"/>
<item href="e9781668097816/fonts/Tomorrow-Regular.ttf" id="Tomorrow-Regular" media-type="font/otf"/>
<item href="e9781668097816/fonts/NotoSerif-Regular.ttf" id="NotoSerif-Regular" media-type="font/otf"/>
<item href="e9781668097816/xhtml/SS_US_adult_signup_front.xhtml" id="SS_US_adult_signup_front" media-type="application/xhtml+xml"/>
<item href="e9781668097816/xhtml/SS_US_adult_signup_back.xhtml" id="SS_US_adult_signup_back" media-type="application/xhtml+xml"/>
<item href="e9781668097816/styles/SS_signup.css" id="SS_signup" media-type="text/css"/>
<item href="e9781668097816/xhtml/SS_recommendpage.xhtml" id="SS_recommendpage" media-type="application/xhtml+xml"/>
<item href="e9781668097816/styles/SS_recommendpage.css" id="SS_recommendpage_1" media-type="text/css"/>
<item href="e9781668097816/images/buylink_9781668046371_cover.jpg" id="buylink_9781668046371_cover" media-type="image/jpeg"/>
<item href="e9781668097816/images/buylink_9781668096949_cover.jpg" id="buylink_9781668096949_cover" media-type="image/jpeg"/>
<item href="e9781668097816/images/buylink_9781982139452_cover.jpg" id="buylink_9781982139452_cover" media-type="image/jpeg"/>
<item href="e9781668097816/images/buylink_9781982154134_cover.jpg" id="buylink_9781982154134_cover" media-type="image/jpeg"/>
<item href="e9781668097816/images/buylink_9781982175214_cover.jpg" id="buylink_9781982175214_cover" media-type="image/jpeg"/>
<item href="e9781668097816/images/buylink_9781982194840_cover.jpg" id="buylink_9781982194840_cover" media-type="image/jpeg"/>
</manifest>
<spine toc="ncx">
<itemref idref="cover"/>
<itemref idref="SS_US_adult_signup_front"/>
<itemref idref="title"/>
<itemref idref="dedication"/>
<itemref idref="note"/>
<itemref idref="authornote"/>
<itemref idref="epigraph"/>
<itemref idref="prologue"/>
<itemref idref="ch01"/>
<itemref idref="ch02"/>
<itemref idref="ch03"/>
<itemref idref="ch04"/>
<itemref idref="ch05"/>
<itemref idref="ch06"/>
<itemref idref="ch07"/>
<itemref idref="ch08"/>
<itemref idref="ch09"/>
<itemref idref="ch10"/>
<itemref idref="ch11"/>
<itemref idref="ch12"/>
<itemref idref="ch13"/>
<itemref idref="ch14"/>
<itemref idref="ch15"/>
<itemref idref="ch16"/>
<itemref idref="ch17"/>
<itemref idref="ch18"/>
<itemref idref="ch19"/>
<itemref idref="ch20"/>
<itemref idref="ch21"/>
<itemref idref="ch22"/>
<itemref idref="ch23"/>
<itemref idref="ch24"/>
<itemref idref="ch25"/>
<itemref idref="ch26"/>
<itemref idref="ch27"/>
<itemref idref="ch28"/>
<itemref idref="ch29"/>
<itemref idref="ch30"/>
<itemref idref="ch31"/>
<itemref idref="ch32"/>
<itemref idref="ch33"/>
<itemref idref="ch34"/>
<itemref idref="ch35"/>
<itemref idref="ch36"/>
<itemref idref="ch37"/>
<itemref idref="ch38"/>
<itemref idref="ch39"/>
<itemref idref="ch40"/>
<itemref idref="ch41"/>
<itemref idref="epilogue"/>
<itemref idref="ack"/>
<itemref idref="SS_recommendpage"/>
<itemref idref="authorbio"/>
<itemref idref="adcard"/>
<itemref idref="SS_US_adult_signup_back"/>
<itemref idref="copyright"/>
</spine>
<guide>
<reference href="e9781668097816/xhtml/cover.xhtml" title="Cover" type="cover"/>
<reference href="e9781668097816/xhtml/cover.xhtml" title="SRL" type="text"/>
</guide>
</package>
Both versions of the OPF are wrong. The original has the wrong media type. epubsana changed it to yet another incorrecty media type. For truetype fonts, the media type should be
media-type="font/ttf"/>.
This is the list of media types in the ePub 3.3 spec.
https://www.w3.org/TR/epub-33/#sec-core-media-types