`plotly.graph_objects.Scatter` property `fillgradient` does not plot gradients with v5.22.0 in python

Description

I am trying to use the fillgradient in a scatter plot with plotly.
I copied the documentation code for its use, but on code execution, the gradient does not appear.

Operating system & Environment

• OS: macOS Sonoma 14.5
• language: python 3.11.3
• relevant libraries (working on VSCode in a jupyter notebook)
  • plotly 5.22.0
  • jupyterlab 3.6.3
  • ipywidgets 8.0.4
  • notebook 6.5.4

Code used

import plotly.graph_objects as go

fig = go.Figure(
    [
        go.Scatter(
            x=[1, 2, 3, 4],
            y=[3, 4, 8, 3],
            fill=None,
            mode="lines",
            line_color="darkblue",
        ),
        go.Scatter(
            x=[1, 2, 3, 4],
            y=[1, 6, 2, 6],
            fill="tonexty",
            mode="lines",
            line_color="darkblue",
            fillgradient=dict(
                type="horizontal",
                colorscale=[(0.0, "darkblue"), (0.5, "royalblue"), (1.0, "cyan")],
            ),
        ),
    ]
)

fig.show()

Output in picture:

Reproduza o problema do exemplo de Python fornecido em um notebook Jupyter usando o ambiente Plotly 5.22.0 listado, começando por fig.show() e pela configuração de Scatter fillgradient. Compare a saída renderizada com o exemplo documentado de preenchimento com gradiente; o problema estará resolvido quando o gradiente configurado aparecer no preenchimento do scatter.