Wildcard subdomains (any change in nginx?)

I was using wildcard for including all subdomains for a server_name as

server_name domain.com;

I just installed nginx 1.2.3, but this configuration no longer works and
subdomains lead to nginx 404 page. Since I followed a standard procedure
of
installation via apt-get, I suspect something has been changed in new
versions of nginx.

Now, I can only use wildcard for subdomains with

server_name domain.com *.domain.com;

Did I miss something or it is the nginx policy in new versions and
forthcoming ones to discard subdomains without *.domain.com ?

Posted at Nginx Forum:

On Wednesday 12 September 2012 22:49:43 etrader wrote:

I was using wildcard for including all subdomains for a server_name as

server_name domain.com;

[…]

This has never included subdomains. Probably it worked for you just
because it
was the default server block. But after the update something has been
changed in
your configuration.

wbr, Valentin V. Bartenev