Can I disable `wp-tinymce.php` load as script?

Seems that the problem is with the virtual site config – the docroot in the fastcgi config. In my example I’m using nginx webserver and PHP7. It has to look like this:

location / {
        try_files $uri $uri/ /index.php?q=$request_uri;
    }

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }