Incorrect legend style with x unify hovermode

Hello

I noticed that something is incorrect with the legend styling, especially when we use the x unify hovermode.

Here is a short example:

import plotly.graph_objects as go

x = ["A", "B"]
fig = go.Figure(data=[
    go.Bar(
        x=x, 
        y=[1, 1],
        marker=dict(color=["blue", "red"], pattern_shape=["/", ""]),
        name="First Bar"
    ),
    go.Bar(
        x=x, 
        y=[-1, -1],
        marker=dict(color=["green", "purple"], pattern_shape=["/", ""]),
        name="Second Bar",
    ),
])

fig.update_layout(hovermode="x unified")
fig.show()

As we can see, the second bar uses the "general" legend style, which leads to an incorrect style for the items on the right.
plotly version = 5.24.1

And thank you for your amazing work!

首先使用 plotly.py 5.24.1 运行提供的 Python 示例，并在 hovermode 设置为 "x unified" 时比较两个条形图的图例样式。跟踪图例渲染的入口点，并添加回归检查，以显示第二个条形图的图例项使用了正确的样式。