Mystery Graph.react.js error for treemap

Dash Python
1

Plotly Dash app.
Treemap displays and works fine (hovering + clicking on sectors). However upon inspecting in browser with “Inspect” page freezes with:

Paused on exception
a - Graph.react.js:93:42
TypeError: e.data.mode is undefined

// Highlights line:
  fullPoint.pointNumber

Closing the inspection tool, treemap continuous to work.
Reopening Inspect, the number of errors grew, page freezes.

I tested the same data frame and dash app layout with a sunburst chart. No errors there.

Did anyone have this error with treemaps?

Code sample:

df_wardrobe = pd.DataFrame(
    {"continent": ["EU","EU","US","US"],
    "clothes": ['top', 'bottom', 'top', 'bottom'],
    'qty': [1,2,3,4]})

fig_wardrobe_treemap = px.treemap(
    df_wardrobe,
    path=["continent", "clothes"],
    values="qty",
    color="qty",
    color_continuous_scale="viridis",
)

app.layout = [
            dcc.Graph(
                figure=fig_wardrobe_treemap,
            )]