It seems it only supports Arabic texts that are not voweled. If they are voweled (Arabic words don't always have vowels. If they are present it comes as a "diacritical" mark), then it doesn't support it.
Example:
ذهب الولد
It works fine.
ذَهَبَ الوَلَدُ
it reads as:
ذ َ ه َ ب َ ا ل وَ لَ دُ
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