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Looking at the error message, are you creating an epub2 or an epub3 file? An epub3 would have epubcheck throw that error since font/ttf and application/font-sfnt would be the accepted font types for a TTF font while application/x-font-ttf is accepted in an epub2. Oddly using application/vnd.ms-opentype for a TTF font does not throw an error.
This really should not cause the split lines you are seeing.
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