Fast Site Prevew -- www issue

[Maxim Makarenko]

Hello.

I set up fast site preview on external domain and noticed that Plesk creates only this alias:
<sitename>.XX-XX-XX-XX.externaldomain.com

Many sites forwards the visitors to www version of the site. In this case an error occurs. I tried to change the corresponding setting in "Hosting settings", but it did not help.

I think Plesk should create 2 aliases:
<sitename>.XX-XX-XX-XX.externaldomain.com
www.<sitename>.XX-XX-XX-XX.externaldomain.com