How to import parent-child links from Issue Navigator ... Menu > Import issues from CSV?

[Peter Knudsen]

I am trying to allow someone that is not a Jira Administrator to import issues into their project with parent-child relationships.

This question has been asked before and the answer has been no. I am asking again because I noticed that I am able to in the Jira sandbox.

In our Jira sandbox, I am able to import parent-child relationships from the project by going to Issue Navigator ... Menu > Import issues from CSV (not the External System Import in Jira settings).

In our production Jira, I am not able to import parent-child relationships from Issue Navigator ... Menu > Import issues from CSV.

Is this just a difference between how the Jira sandbox and production sites work, or is there something different between the configuration of the sandbox and production sites that I can change to allow this functionality on the production site?

According to this documentation, it should not be possible except when using the External System Import (Cause 2 and Solution 2), but I am able to in the sandbox for some reason: 

Unable to find the IssueID and ParentID fields when importing parent-subtask relationships via External System Import - CSV | Jira | Atlassian Documentation