plotly.graph_objects.sankey.node.Line does not work with an array of color

Hi everyone,
The docs says that the argument color either takes a color or an array of colors. However, when I pass an array of colors, it always shows up black instead of the specified color. Here is a code example that does the bug :

import plotly.graph_objects as go

# define the node labels and colors
node_labels = ["A", "B", "C", "D"]
node_colors = ["red", "blue", "green", "purple"]

#Array of colors for the node's line
node_line_colors = ["black", "gray", "orange", "yellow"]

# define the links between the nodes
link_source = [0, 0, 1, 1, 2, 2]
link_target = [1, 2, 2, 3, 0, 3]
link_value = [8, 4, 2, 6, 10, 12]

# create the Sankey diagram
fig = go.Figure(data=[go.Sankey(
    node=dict(
        label=node_labels,
        color=node_colors,
        line=dict(
            color=node_line_colors, # Colors I want to have for my diagram
            width=10 # Bigger to properly see that the colors aren't here
        )
    ),
    link=dict(
        source=link_source,
        target=link_target,
        value=link_value
    )
)])

fig.show()

I also tried to manually add the colors like this instead of using the constructor :
fig.data[0]['node']['line']['color'] = node_line_colors

But the node's lines still show up black instead of coloried.
Expected result :
black line for A node,
gray line for B node,
green line for C node,
purple line for D node ;

Actual result :

Thanks,

Start by running the provided go.Sankey example and compare the documented array behavior with the rendered node lines. Trace how node.line.color is handled when passed through the Sankey constructor, then verify that the four expected colors render on the corresponding nodes.