Steps to reproduce the issue

• Go to Content > Fields
• Create an articles field. Enter title Field 1. Nothing else.
• Save&Close it.
• A field Name ("alias") field-1 has been created automatically.
• Select the field in the fields list view.
• Click on Batch button.
• Make settings (see image)

• Click on Process.

Expected result

• No duplicate of the copied field with same Name. Like aliases elsewhere in Joomla every field must have a unique Name.
• Joomla alters the Name like in other batch processes.

Actual result

• An exact copy of the field is created (just ID differs).
• It can be published by clicking on the status icon (see image)

System information (as much as possible)

• Joomla 3.9.28-dev
• PHP 8.0.1

Additional comments