sunburst bug when color and values correspond to the same column

[emmanuelle]

Reported in the community forum https://community.plotly.com/t/plotly-sunburst-node-colors/41037

import plotly.express as px
import numpy as np
df = px.data.gapminder().query("year == 2007")
fig = px.sunburst(df, path=['continent', 'country'], values='lifeExp',
                  color='lifeExp',
                  color_continuous_scale='RdBu')
fig.show()

The color of a sector should be the average of its children but it seems to be the sum for this case.