It's basic, as Atlassian were given so many use cases, there's no way they could code for all of them.
You click "clone", and you get a new issue in the same project with all the same fields set the same as the original. As a new issue, the history and comments are removed, as they relate to the old one (Optionally, it prefixes the summary with "clone" and provides a link between the two)
There are a number of add-ons that do more - clone and move, and clone plus are the two I've used. You'd want to compare them for yourself (although I lean towards clone plus myself)
JIRA "Clone" feature will work for you if you just need a copy of a JIRA issue to/from a JIRA Project (NOTE: it has no dependencies or relationship at all, it's just a pure copy).
If you have to 2 separate JIRA instances, you can do a "Remote Copy" to your JIRA instance (This option will only appear if you have configured application links between your 2 JIRA instances).
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