When viewing the Share Settings of a document in Vault, an Auto Managed Group displays empty. Why does the Auto Manager Group display empty?
This is because the status of members in Auto Managed Group is set to inactive after the document is created. This Auto Managed Group also appears in the Share Settings and displays empty when creating a document with the same type. Deleting the records of members in the User Role Setup makes this Auto Managed Group no longer appear in the Share Settings.
Vault Documentation: Vault Help