I ran into a similar problem with snapshots of a forum and email server – if there are scheduled emails when you take the snapshot they get sent out again if you create a new test server from the snapshot. And similarly for the forum.
I’m not sure what the solution is either. The emails are sent via an SMTP so it’s not as simple as disabling email (ports, firewall, etc.) on the new test server.
I use Ecosia instead of Google, but I know that Google recently added a “forums” category to the top of their search. Have you tried that? Hopefully it will help bring back to life independent forums.