Duplicated notes retain the source note's $Prototype assignment. Consider prototype 'Note A' used by 'Note B', then
- duplicating 'Note A' makes a new note 'Note A copy'. The duplicate 'Note A copy' is itself a new prototype note but has no prototype link to B; B retains its 'A' $Prototype assignment. That is congruent with links & duplication, noting that prototype assignment is effected as a (hidden) link. The duplicate does have copies of other outbound links for A, but prototype links are no longer duplicated.
- duplicating 'Note B' makes a new note 'Note B copy'. The duplicate 'Note B copy' is a new normal note as retains 'note A' as its prototype.
- duplicating both notes together. the same outcome occurs. Although 'Note A copy' is a prototype, both 'Note B' and 'Note B copy' retain 'Note A' as their prototype.