I have some situations where kickstart snippets are not expanding.
I have a kickstart script redhat-register with the Template checked:

echo "redhat-register"
$SNIPPET('redhat_register')
echo "my-redhat-reg"
$SNIPPET('spacewalk/1/my-redhat-reg')
echo "root-ssh-keys"
$SNIPPET('spacewalk/1/root-ssh-keys')

The subject code in the generated kickstart file is as follows:
%post --log /root/ks-post.log.3
echo "redhat-register"

begin Red Hat management server registration

mkdir -p /usr/share/rhn/
wget http://llrhna01.ccci.org/pub/RHN-ORG-TRUSTED-SSL-CERT -O /usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT
perl -npe 's/RHNS-CA-CERT/RHN-ORG-TRUSTED-SSL-CERT/g' -i /etc/sysconfig/rhn/*
rhnreg_ks --serverUrl=https://llrhna01.ccci.org/XMLRPC --sslCACert=/usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT --activationkey=1-f98a7e024eec304590aafaece9ef4a81

end Red Hat management server registration

echo "my-redhat-reg"
$SNIPPET('spacewalk/1/my-redhat-reg')
echo "root-ssh-keys"
date
set -x -v
...

The files are:

[root@llrhna01 ~]# ls /var/lib/cobbler/snippets/redhat_register
/var/lib/cobbler/snippets/redhat_register
[root@llrhna01 ~]# ls /var/lib/cobbler/snippets/spacewalk/1/my-redhat-reg
/var/lib/cobbler/snippets/spacewalk/1/my-redhat-reg
[root@llrhna01 ~]# ls /var/lib/cobbler/snippets/spacewalk/1/root-ssh-keys
/var/lib/cobbler/snippets/spacewalk/1/root-ssh-keys
[root@llrhna01 ~]#

Note that one of my org snippets expands and the other doesn't.