Plesk password protected directories does not work

[[QT]bender]

Plesk 9.0.1
Litespeed 4.0.13
CentOS 5 (Final)

Using Plesk control panel customer creates protected directory(e.g '/diary'). Plesk modifies 'httpd.include' config and add section:

<Directory "/var/www/vhosts/domain.com/httpdocs/diary">
                AuthType Basic
                AuthName "Secure area"
                AuthUserFile /var/www/vhosts/domain.com/pd/d..httpdocs@diary
                require  valid-user
        </Directory>

But litespeed seems like ignore this configuration section and auth does not work.

Everything works fine if we add auth code to .htaccess file.