`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:

在列出的 Plotly 5.22.0 环境中，使用提供的 Python 示例在 Jupyter notebook 中重现该问题，从 fig.show() 和 Scatter fillgradient 配置开始。将渲染后的输出与文档中的渐变填充示例进行比较；当配置的渐变出现在散点填充中时，问题即告完成。