A $NeverComposite Boolean can be used to mark a note that should never be added to composites. By default false, if set to true at document level, a document will suppress composite behaviour in maps altogether.
When opening legacy files created in previous versions, Tinderbox scans the file in search of overlapping notes that will be interpreted as composites. This situation most often arises in documents that are seldom if ever used with maps. If Tinderbox finds apparently accidental composites, it marks the notes in the container as $NeverComposite.