I honestly think Qt is converting the app icons to pixmaps on-the-fly, so to speak. Not sure how it accomplishes that, or what components might be required for it to work.
For what it's worth though, Sigil DOES segfault on my Arch system whenever I rename libQt5Svg.so.5.15.1. I can't easily remove qt5-svg it to fully test since it's required by calibre, qt5ct and kvantum-qt5.
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