I'm currently working with a global brand who need localisation in each of their territories.

They're operating on a single .com domain name, with different language versions in separate directories.

Example:
domain.com/en/
domain.com/fr/
domain.com/ar/

We're using ahreflang tags to make sure Google shows the correct language version for each region.

Now onto my question...

As the domain is a .com with an English company name, when it comes to the Arabic version of the website, will having a completely mixed language URL like this be detrimental to the site's performance in searches from the middle east?

Currently we're coming up with URLs like the following:

domain.com/blog/عنوان بلوق عربية طويلة حقا على شيء مثير جدا للاهتمام

Is this a bad thing?