Hi, welcome to the community!
My experience:
It is not because it is Arabic, but text issue in any language on DALL-E, and not working perpectly because:
DALL·E is not currently designed to produce text, but to generate realistic and artistic images based on your keywords or phrases.
https://help.openai.com/en/articles/6781228-how-can-i-generate-text-in-my-image
the official link is removed but the page was this:
Also you can visit following topics:
These are samples:
English phrase:
Turkish Phrase:
Arabic phrase: