Webmin update changes ports in Apache

I have a proxy server in front of Apache. Virtualmin knows about this configuration because I changed the listen ports inside Virtualmin interface. Then I changed ports in /etc/apache2/ports.conf too. Everything worked perfect before updating Webmin to 1.770. After updating Webmin apache2 service did not start. I have experience with this issue. It was easy modifying again ports and NameVirtualHost in apache2.conf then restarting the service.

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One more issue related to this update. It was for the first time when I updated Webmin from its interface pushing a button in Statistics page. In Debian apt-get update && apt-get upgrade did not show any upgrades. Is this a new behavior for updating Webmin/Virtualmin?

Webmin doesn't touch the Apache config on upgrade though..