This CFS issue exists in CSM 1.5.0, CSM 1.5.1, CSM 1.5.2, and CSM 1.6.0.
CFS has safeguards in place that prevent a CFS source from being deleted while it is still in use. There are three places where a source can be specified in CFS:
source field of a layer of a CFS configuration.additional_inventory layer of a CFS configuration.This issue causes that final safeguard to be overlooked, allowing an administrator to delete
any source that is only used in additional_inventory layers of CFS configurations.