I would personally implore you to investigate JIRA Webhooks and JIRA REST API and handle it yourself. This is the Atlassian supported method currently. It's also worth noting that Copying an issue will Copy the sub-tasks also.
I am not aware of any add-on that provides this functionality within JIRA Cloud.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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