go.Contour doesn't render correctly in animation frames when multiple traces are present

Start by running the provided minimal Python example in plotly.py and compare animation with only go.Contour against animation with the additional go.Scatter traces. Trace the animation/rendering path used by Figure and Frame for contour data; done means the contour renders correctly throughout frames when multiple traces are present, without regressing the single-trace case.

I'm encountering an issue with plotly.graph_objects.Figure animations. When using go.Contour inside go.Frame along with additional traces such as go.Scatter, the contour plot no longer renders correctly during animation. However, if I only include the go.Contour trace by itself in each frame, it animates perfectly.
Here's a minimal reproducible example:

import plotly.io as pio
pio.renderers.default = 'browser'
import plotly.graph_objects as go
import numpy as np

z_base = np.array([
    [10, 10.625, 12.5, 15.625, 20],
    [5.625, 6.25, 8.125, 11.25, 15.625],
    [2.5, 3.125, 5., 8.125, 12.5],
    [0.625, 1.25, 3.125, 6.25, 10.625],
    [0, 0.625, 2.5, 5.625, 10]
])

lk_x=[0,0,1,1,0]
lk_y=[0,1,1,0,0]

data_line = go.Scatter(x=lk_x, y=lk_y, mode='lines', fill='toself', fillcolor='rgba(60, 53, 48, 0.5)', line_color='black', showlegend=False)

scales = np.linspace(0.2, 1.0, 10)
frames = []
for i, s in enumerate(scales):
    z_scaled = z_base * s
    frames.append(go.Frame(
        data=[
            go.Contour(
                z=z_scaled,
                colorbar=dict(
                    thickness=25,
                    thicknessmode='pixels',
                    len=0.6,
                    lenmode='fraction',
                    outlinewidth=0
                )
                ,zorder=2
            ),
            go.Scatter(
                x=[0, 1, 2, 3, 4],
                y=[0, 1, 1.5, 2, 3], 
                mode='lines',
                line=dict(color='black', width=2),
                showlegend=False,
                zorder=0
            ),
            data_line
        ],
        name=f"scale_{i}"
    ))


fig = go.Figure(
    data=frames[0].data,
    frames=frames
)

fig.update_layout(
    title="Contour",
    updatemenus=[{
        "buttons": [
            {"label": "play", "method": "animate", "args": [None, {"frame": {"duration": 500}, "fromcurrent": True}]},
            {"label": "pause", "method": "animate", "args": [[None], {"mode": "immediate", "frame": {"duration": 0}}]}
        ],
        "type": "buttons",
        "showactive": True,
        "x": 0.1,
        "y": -0.1
    }],
    sliders=[{
        "steps": [{"args": [[f.name]], "label": f"Step {i+1}", "method": "animate"} for i, f in enumerate(frames)],
        "x": 0.1,
        "len": 0.9
    }],
    width=500,
    height=500
)

fig.show()

only include the go.Contour trace：

with additional traces：