How to edit/delete 'Recipients sources' in a 'Form response'?

'Archive mailing' in a form response is according to SO Help ment to be used "To keep track of all mailings related to your selections and projects" but, actually creates a link to 'Ricipient sources', which can't be edited or deleted. What is the idea here? Why such link in a form response which is only ment to be recipients triggered by a form..?

If at later stage changing 'Archive mailing' to another project, the 'Ricipient sources' will still be connected to the old project (!!) and can't be edited or deleted.

This leads to that new project members added to the old project will recieve form responses which are no longer is relevant.

Understand that this is a known issue but it has by some unknown reason not been filed as a bug.