Hi @3tayesh,
I am sorry, but I am still not seeing the issue. Despite my best efforts, I was unable to reproduce the issue you are describing in the code or in any other way. Before my plugin generates the custom permalink for a new post, the native slug is always translated.
Could you film a screencast of all the steps you do while saving the post?
I am not sure whether this would help, but there is something you should think about. Permalink Manager saves custom permalinks statically, therefore if you modify the post title after the custom permalink is generated, the custom permalink will not be automatically updated. You can change it in the plugin settings:
https://permalinkmanager.pro/docs/basics/automatically-update-the-permalinks/
Aside from that, it appears that you are using the premium version of the plugin. Please remember that this support forum is intended for Permalink Manager Lite users.
Best regards,
Maciej Bis