Yes, it turns out:
   (<,<'') -: {:: a:
1

I will not go into how I was mistaken.

But the key thing is: the paths returned by {::
only navigate boxes, they do not concern
themselves with the content of those boxes.

   ({:: 1 2 3;4 5 6) -: {:: 1;''
1

I think you were asking why the shape of the
leaves got lost.  And the answer is: that is
irrelevant here.

If you want the shapes of the leaves you should
be using a different operation.

If I have mis-understood your question, please let me know.

-- 
Raul
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