Animation deletes traces

Below is a minimal example, where using a slider to show different traces will delete another trace.

The example plots a grid of points and uses a slider to interactively display selected rows, however, the original grid plot disappears as soon as the slider is moved.

This looks like a bug to me. If it’s not, how can I prevent that trace from disappearing?

import numpy as np
import plotly.graph_objects as go
# generate grid
N = 10
x, y = np.meshgrid(np.linspace(0, 1, N), np.linspace(0, 1, N))
z = np.zeros((N, N))
# plot
fig = go.Figure(
    # all points (THIS DISAPPEARS!)
    data=[go.Scatter3d(x=x.flatten(), y=y.flatten(), z=z.flatten())],
    # single rows animated via slider
    frames=[go.Frame(data=[go.Scatter3d(x=x[i], y=y[i], z=z[i])], name=f"{i}") for i in range(N)],
    layout_sliders=[dict(steps=[dict(method='animate', args=[[f"{k}"]], label=f"{k}") for k in range(N)])])
fig.write_html('plot.html')
fig.show()

Two other weird things (potential bugs), which might be unrelated:

• Setting a marker size on the first trace also changes the marker size of the animated traces. Should that be the case?!
• The interactively opened plot behaves differently from opening the saved html plot (the second one starts playing the animation right away, the first one doesn’t).

I have also posted this in the community forum but without any reactions so far.

首先运行最小 Python 示例，并比较 fig.show() 的交互式结果与保存的 plot.html。调查动画帧和 slider 行为，包括消失的网格 trace、共享的 marker 大小以及不同的 autoplay 行为；当观察到的行为得到解释，并且确认的 bug 已在不破坏其他 trace 的情况下修复时，即视为完成。