The customer gave me an XLSX of requirements. I converted it to CSV, used my script to modify the CSV to work as an import to Jira, and then imported that CSV via the Bulk Import option (creation only).
Now the customer has given me an updated XLSX. I converted it to CSV, used my script to modify the CSV to work as an import to Jira (which includes matching their customer's ids with my Jira ids), and then imported that CSV via the External System Import option (to modify existing).
In the updated XLSX, some of the requirements have changed, some have not. But *all* the Updated fields show the time of the External System Import. Looking at the requirements that were the same in both imports, the History shows no change (but as mentioned Updated shows time of import).
Why is Updated being updated when History shows no modification?