See: https://inh.wikipedia.org/wiki/Special:Prefixindex/prefix%3DАСЯ%26namespace%3D10?prefix=Администратора+статус+ялар&namespace=4

It seems this URL is wrong. /prefix%3DАСЯ%26namespace%3D10 this is weird. Because the prefix behaves like ?prefix=, not /prefix

Where you get this URL?

See https://inh.wikipedia.org/wiki/%D0%93%D3%8F%D1%83%D0%BB%D0%B0%D0%BA%D1%85%D0%B0:%D0%A3%D0%BA%D0%B0%D0%B7%D0%B0%D1%82%D0%B5%D0%BB%D1%8C_%D0%BF%D0%BE_%D0%BD%D0%B0%D1%87%D0%B0%D0%BB%D1%83_%D0%BD%D0%B0%D0%B7%D0%B2%D0%B0%D0%BD%D0%B8%D1%8F?prefix=%D0%90%D0%B4%D0%BC%D0%B8%D0%BD%D0%B8%D1%81%D1%82%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%B0&namespace=4 correct one, This is working as expeced.

Hm. I'm sorry. This should be investigated by me in more detail. Perhaps this is the result of my mistake.

But this page is produced some UX problems:

1. Link https://inh.wikipedia.org/wiki/Гӏулакха:Указатель_по_началу_названия/Википеди:Администратора is worked, but argument is not transferred into prefix box:

2. If then be filling prefix box by random text (with keeping main namespace), and press "show" button - the result remains unchanged!

(produced URL - https://inh.wikipedia.org/wiki/Гӏулакха:Указатель_по_началу_названия/Википеди:Администратора?prefix=поотртежтцжцецоэнь&namespace=0 )

3. If then filling prefix box by correct text and select valid namespace - the result is empty!

(produced URL - https://inh.wikipedia.org/wiki/Гӏулакха:Указатель_по_началу_названия/Википеди:Администратора?prefix=Администратора&namespace=4 )

This is not specific for this wiki only, this is reproduced everywhere.

@Kaganer

Link https://inh.wikipedia.org/wiki/Гӏулакха:Указатель_по_началу_названия/Википеди:Администратора is worked, but argument is not transferred into prefix box:

This will fix soon. See https://gerrit.wikimedia.org/r/#/c/431281/

If then be filling prefix box by random text (with keeping main namespace), and press "show" button - the result remains unchanged!

Yes, We are aware of this problem, But Thanks for reporting us :)

Ok, thanks