There is, and it's part of qt5's Svg component (and windeployqt/macdeployqt will include the plugin and therefore include the entire component since the imageformats plugin links to libQt5Svg).
Maybe when Sigil still used QtWebkit the svg files inside of a book depended on Qt Svg for the previewer? I don't know and I'm not willing to go back in time and check... It's not really important to the here and now.
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