We recently fixed a bug that prevented previewing embedded fonts in a resource tab whenever the path to Sigil's temp directory contained a space, but that didn't effect properly embedded fonts from rendering in the Preview widget. If it's not down to a css syntax or path error, it's typically down to problematic fonts whenever they won't render in a browser (like QtWebEngine or QtWebkit). There's a lot of terrible font files floating around out there. But if it renders when it's installed as a system font, that's usually a dead giveaway that it's just not being embedded in the epub correctly.
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