Wordpress 404 with utf8 percent-encoded characters in URL

I don't know if this depends on Wordpress, Nginx, or what else... But I have this problem:

A wp site uses categories names as permalinks, like site.com/catname/. Those name are in arabic.

The url looks something like this:

https://exampe.com/سكس-hd/

which can be translated in 2 different ways:

https://example.com/%d8%b3%d9%83%d8%b3-hd/ https://example.com/%D8%B3%D9%83%D8%B3-hd/

the first one, with lowercases, works, but the second gives a 404. This creates many issues, also in Google indexing.

How can I make the 2 requests point to the same content?

this

$_SERVER['REQUEST_URI'] = strtolower($_SERVER['REQUEST_URI']);

In the index.php fixes the issue but it's a bad workaround