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Your problem description isn't clear - is the diacritic character itself displayed correctly and the paragraph breaks on the character, or is the character not rendered correctly?
PDFs define diacritics in a lot of ways, Calibre handles some of the common occurrences, but taking care of some of the more obscure ones can be difficult. Beyond that support for diacritics will depend on your reading system - most reading systems don't have comprehensive fonts that cover all languages.
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