After adding the patch plesk-9.5.4-hotfix1 Expand does not refresh clients.
Error:

<result>
<status>error</status>
<errcode>4003</errcode>
<errtext>[Operator] PleskAgent error. Plesk client #233 (#94) 'admin' has unknown or wrong Plesk identifier. Please try to reload all Plesk server #3 clients.</errtext>
<id>233</id>
<server_id>3</server_id>
<plesk_client_id>94</plesk_client_id>
<login>admin</login>
</result>
<result>

Plesk servers without the patch properly refreshes the list of clients.