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.
Resistance is not the most concerning aspect of antibiotics, despite it being the most covered in the news. We need to be moving away from antibiotics. https://humanmicrobiome.info/antibiotics/#harms-of-antibiotics
It’s quite depressing to continually see this blind focus on resistance and more & new antibiotics.