Renaming a script field through the script fields page is locked by design. You can still edit the
field name by going to "JIRA Administration > Issues > Custom Fields > [Edit]". On all screens, the field is now shown with the expected new name that was set through the JIRA administration page:
But the Script Runner configuration under "JIRA Administration > Add-ons > Script Fields" still shows the field with its original name:
This leads to confusion as there is a mismatch between the script fields page and what is actually shown on an issue.