I see a new "Edit Web Content" option which opens File Manager provided user has proper access rights. For users with minimal access plans the option is still there, but when clicked it shows:
Following errors occured while performing operation
Error opening directory /home/username/home/username/public_html No such file or directory
So please make this new option to respect permissions and if a Webmin user doesn't have access to File Manager, then not to show the "Edit Web Content" option at all.