Has anyone successfully set colors for ribbons via a non-trivial atom selection?

The syntax is supposed to be:
set ribbon_color, color, selection, state

set ribbon_color, green, /obj01//B

should set the ribbon color to green for only chain B of a multi-chain object.  However, in practice it appears that setting the ribbon_color applies only to complete objects.  Is this a bug or an undocumented expected behavior?


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