Plotly Surface - Wrong customdata shape

[Davide-sd]

It appears that I have found a bug when using customdata with go.Surface. In the following example, I have discretized two directions with a different number of points. The tooltip is going to visualize information coming from x, y, z coordinates as well as customdata.

import numpy as np
import plotly.graph_objects as go
import plotly.express as px

x = np.linspace(-3, 3, 50)
y = np.linspace(-5, 5, 100)
x, y = np.meshgrid(x, y)
z = np.sqrt(x + 1j * y)
angle = np.angle(z)
z = np.absolute(z)

fig = go.Figure()
skw = dict(
    showscale=True,
    colorbar=dict(
        title="Argument",
        titleside="right",
        tickvals = [
            -np.pi,
            -np.pi / 2,
            0,
            np.pi / 2,
            np.pi,
        ],
        ticktext = [
            "-π",
            "-π / 2",
            "0",
            "π / 2",
            "π",
        ]
    ),
    cmin = -np.pi,
    cmax = np.pi,
    colorscale=px.colors.sequential.Rainbow,
    surfacecolor=angle,
    customdata=angle,
    hovertemplate="x: %{x}<br />y: %{y}<br />Abs: %{z}<br />Arg: %{customdata}",
)
fig.add_trace(
    go.Surface(x=x, y=y, z=z, **skw)
)
fig

This is the output picture. You can see a discontinuity at y=0. However, if you move the mouse on the right of the discontinuity, customdata won't show up.

On the other hand, if I'm going to use customdata=angle.T, than the tooltip will show the correct data.

I believe that customdata should have the same shape as the x, y, z coordinates.

[empet]

This is a known bug: https://github.com/plotly/plotly.js/issues/5003