[CentOS] Bind update overwrites named.conf

I just had a customer's bind server lose all of it's local DNS records. Yum updated the bind packages this morning at ~6am, and replaced the original /etc/named.conf file, saving the old as named.conf.rpmsave. This seems like the opposite of what it should have done (i.e. save the new file as named.conf.rpmnew). There does not appear to be any difference between the originally shipped conf file and the new one, suggesting that the file should not have been replaced at all. Just wanted to through this out there in hopes it helps someone else before the phone starts ringing...

CentOS release 4.6 (Final) Jul 09 05:59:25 Updated: bind-devel.i386 20:9.2.4-28.0.1.el4 Jul 09 05:59:29 Updated: bind-chroot.i386 20:9.2.4-28.0.1.el4

Chris