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!

Start by running the provided Python example with plotly.py 5.24.1 and compare the legend styling for both bars when hovermode is set to "x unified". Trace the legend rendering entry point and add a regression check showing that the second bar's legend items use the correct style.