Can't get to nodes in nested vocabularies

I have a vocabulary like this:

term A
- term B
- term C
- node d tagged with term A
term E
- node f tagged with term E
term F

In both the Tree and Browsable views of Vocabulary Index, I can drill down to node f, but not node d. It seems like the presence of terms B and C prevents the code from noticing that there's also a node at that level.

E.g., in the Browsable view, when I click on term A, I see terms B and C, but node d isn't listed. When I click on term E, I do see node f.

So it appears that this module assumes a taxonomy term will either contain other terms or nodes, but not both. It would be nice if it could handle both!