Readium not displaying words while Read Aloud

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We have created few sample ePub titles with Read Aloud feature. When we enable read aloud, the text from the title disappears and only the highlighting color for the text is visible. We tried to troubleshoot the issue by various methods. We found that if we disable the font-family in the ePub, the text is visible correctly.

Is this coding issue or Readium issue? Kindly advice.

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