Summary

The documentation Manage product sandboxes - Manage Marketplace and Atlassian apps in your sandbox explains that when a sandbox is created/copied, apps from the marketplace are not installed. These need to be manually added to the sandbox.

Suggested Solution

It would be helpful to give users the option to automatically install the same apps that already exist in production. This will help provide a closer mirror of their prod environment without the manual process of subscribing to each one.