When Using Automation to move tasks, you can use the custom field Information.
But when you want to use the automation to set custom fields for a new task, you cant use the old custom field Data for any other custom field than a free text field.
For Example I do have the customer Mail as a custom field "Mail" and want to create a new task when the first task is done.
When filling the custom fields via automation I can´t use the old Mail field.