Not displaying plotly line graph rangebreaks to exclude non-business hours AND weekends in python

Question

I'm trying to exclude non-business hours AND weekends from the line chart, but it's not working using the following data:

The data:

The code to plot the line chart:

fig = px.line(df, x=df.index, y='close')

fig.update_xaxes(rangebreaks=[dict(bounds=[16, 9.5], pattern="hour"),
                              dict(bounds=['sat', 'mon'])])

fig.show()

The Output of the line chart:

If I use another type of data, this works, like the example of this link: https://plotly.com/python/time-series/

import plotly.express as px
import pandas as pd

df = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/finance-charts-apple.csv')

fig = px.scatter(df, x='Date', y='AAPL.High', range_x=['2015-12-01', '2016-01-15'],
                 title="Hide Weekend and Holiday Gaps with rangebreaks")
fig.update_xaxes(
    rangebreaks=[
        dict(bounds=["sat", "mon"]), #hide weekends
        dict(values=["2015-12-25", "2016-01-01"])  # hide Christmas and New Year's
    ]
)
fig.show()