Whether an attribute exists for a particular item depends on its existence in the item's template, not its form.
Attributes can be created/modified in either a form (if associated with the item's template) or the Item Attributes pane. If an attribute is edited within a form, it will be added to the item if it doesn't yet exist for that item. Alternatively, if an attribute is inserted in the Item Attributes pane, it will also be updated to reflect the change within the form.
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