Labels not showing in hierarchies

I have constructed hierarchies following simple steps of importing the data, parsing it, stratifying it. The Tidy Tree works well, but when this is included, the labels do not show:

const root = d3.hierarchy(data);

On a related note, what does “Qd” mean at the beginning of a cell for hierarchical data? I notice in Mike Bostock’s Tidy Tree example, the data is simply an array. After stratification, the data comes out already set up in a hierarchy (clearly). Is the const root = d3.hierarchy(data); messing this up?

I’d appreciate insight to this.

Qd is the name given to the Node object once the code is minified. See d3.hierarchy / D3 | Observable for an introduction to this module