Cloning server from snapshot, how to prevent duplicate events?

One of the programs I have running on my server is listmonk email/newsletter manager. I had an email campaign scheduled when I created the snapshot, and when I created a new server from that snapshot it sent the email campaign again (even though the campaign was scheduled for 8am and I created the new server at 1pm).

I'm struggling to wrap my head around this.

For the DNS I have an A record for listmonk.site.com | main server IP. listmonk loads at listmonk.site.com. Then for the test server I have test.site.com | test server IP.

A dummy vhost I created loads at test.site.com.

I think both instances of listmonk are running simultaneously on listmonk.site.com even though they're technically on different servers & IPs, and thus there's no way for me to view and manage them separately?

In Cloudflare email section I can see the server emails for the test server are being sent from root@centos7test.localdomain, and are failing due to not passing SPF, but listmonk sends via Amazon SES, so that's why they went through.

Even if I ran a command to kill all active services (listmonk is running as a service) on the cloned server right after it finishes being created, it would probably still send out some emails before I could get to it, and when the services are restarted they'd start sending out the emails again.

You COULD cancel all email campaigns before creating the snapshot, but that would be tedious, and now I'm wondering if my forum is also performing duplicate actions.

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