duplicated notes don't retain their updated creation date

duplicated notes don't retain their updated creation date

do the following:

- create note and add several files as attachment
- duplicate note (to separate different attachments into their own note)
- change note creation date (via right-click menu "Note info")
- result: note creation date shows updated creation date in list
- (do something, e.g. duplicate note again or select another note and edit - anything)
- result: duplicated note creation date has reverted back to before the date it was changed to!