I am trying to reproduce your problem, but on my test project everything with the URLs seems to be ok. I have tried with two different News items and there is no difference in the URL of the news for the different languages except the "/ar" in the Arabic page and the title of the news. I would like to advice you if you have added additional URLs for the News items to remove them, because the problem can be caused by them. If this solution does not help you can share more detailed information about your approach of creating and displaying News items.
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