Tree control erroneously displays nodes multiple times

I'm attempting to use a Tree control to display some data.
I'm using an HierarchicalCollectionView as the dataProvider. All
the data displays, but it appears on the wrong level. For instance,
on the root level, it displays the root node (correctly marked with
the folder icon as having children), plus all the children (on the
root level!) If I expand the root node, underneath it it displays
its children as expected -- now there are 2 copys of all the
children, one in the correct place and one at the root level. If I
expand 2nd-level nodes, their children (and children's children,
etc) display underneath them... the pattern continues. It looks
like every level of the hierarchy displays ALL the nodes underneath
it, no matter how many levels down.
I think I know why this happens: a
HierarchicalCollectionView's createCursor() function returns an
IViewCursor that treats the collection as linear instead of
hierarchical. The Tree then uses this cursor to visit every node in
the tree, displaying it. When expanding a node, it again uses one
of these linear-type cursors, but on the children of the node
clicked on, so it displays all the children underneath it and their
children, etc. This seems like a major bug in the library -- I'm
pretty sure this isn't a problem with my code. Doesn't it seem
natural to use a HierarchicalCollectionView with a Tree control?
Has no one else ever experienced this issue? I'd expect it to work,
especially since HierarchicalCollectionView extends
ICollectionView, which is what the dataProvider wants. I've looked
through the source of the Tree class (and List, and ListBase) and I
think it all boils down to not using the dataDescriptor's
getChildren() method and instead using createCursor() directly on
the dataProvider. The dataDescriptor's getChildren() method returns
an ICollectionView that correctly only contains the next-level
nodes, not all of the ones all the way to the bottom of the
hierarchy. I think the bad behavior is inherited from ListBase (and
in that class, it actually makes sense... too bad nobody overrode
it in Tree).
Am I wrong? Am I making a mistake somewhere in my code? If
not, is there a workaround? Has a bug report been filed, and should
I file one if this is indeed a bug? Any help or insight would be
greatly appreciated.

OK, after banging my head against this for a day and a half,
I finally have an answer. It seems that the problem is my root node
(and possibly others; I didn't delve that deep) is "open". I guess
something, somewhere is calling
IHierarchicalCollectionView.openNode() on it. Closing the node(s)
makes the problem disappear. I've attached a reproduction script
that's about as simple as I can make it (I guess it could be
simpler with less data, but oh well). Why does this happen? Should
I open a bug report? It seems to me that the correct behavior would
be to have the open node(s) disclosure controls start out open
rather than incorrectly displaying their children as on the same
level as them.

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Tree control erroneously displays nodes multiple times

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