@sak95456465 وعليكم السلام ورحمة الله
Sorry it took me so long to ansewr.
@Abhishek Rao @Anubhav M I updated my InDesign to the latest v. 20.4.1, and the issue is still there. I copied the text from @sak95456465 InDesign document, I pasted it in a fresh document, exported it to PDF, the issue is still there. Diacritics disapear from the text.
Now, it could be the text that came from an outside source such as MS. Word or any other that carried some issues with it into InDesign, I mean I work with InDesign mostly in Arabic and I do type diacritics, but this problem doesn't show on my documents. I will keep an eye on the matter and will report back.
Note. Changing the font, style, leading, kashida, and tracking for example doesn't fix the problem. I believe the issue is in the text engine of InDesign.
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