Webmin failing to remove or comment-out previous settings to Postfix file: /etc/postfix/master.cf

SYSTEM INFORMATION
OS type and version Ubuntu Linux 24.04.1
Webmin version 2.202

I was just wondering if anyone else is having a problem where Webmin fails to parse the master.cd file for Postfix properly?

Webmin is editing/parsing the file with new settings when I change them from the panel interface but it is not removing nor commenting out the older edits it made to the file.

Postfix was failing to boot in which case I looked at the mail log to discover it was complaining about duplicate smtps entries. This led me to manually look at the file with vim only to discover that all the edits made to the file by Webmin (past & present) were there and active. To get it working I had to comment-out all the old edits & just leave the 3 settings for each website intact at the bottom of the file (smtp, submission & smtps). Prior to the error, I did not make any manual edits to the specified file.

Is this perhaps a bug with Webmin or is something awry with my installation?