When you redefine the Shrinkwrap feature, it is automatically recreated, reflecting the changes in the reference model. During the re-creation process the options that affect the external surface collection (quality level, include/exclude quilts, hole filling, ignore small surfaces, component subset, and subset options) are analyzed. Surfaces that are removed as a result of component addition or removal are deleted from the feature. Consequently some Shrinkwrap feature children may fail.