Since the change is in Centos versions instead of a Webmin upgrade? Possibly. I don’t have Sendmail and the Virtualmin version of Webmin so I can’t check. If there is no way to configure where the module looks, then perhaps it is a Webmin issue. Have you checked all of the Webmin configuration options available for the module? Like the little ‘inconspicuous’ gear icon?
I think @Jamie is the person that would know?