uirevision property doesn't keep the viewpoint consistent

The following is the copy-paste of a question I opened on stackoverflow, it looks like to be a bug, so here i go:

I'm trying to keep the viewpoint consistent in my plotly-dash web app after every callback. This should be straightforward according to many already answered questions. The following line of code should do the magic:

fig.update_layout(uirevision='constant')

Unfortunately for me, it looks like that this is not the case for 3D scatter plots, here is a very brief piece of code that should allow to reproduce my problem:

import plotly.express as px
df = px.data.iris()

import dash
from dash import dcc
from dash import html
from dash import Input, Output

app = dash.Dash()
app.layout = html.Div([
    dcc.Dropdown(['option1', 'option2', 'option3'], 'axis', id='x-dropdown', clearable=False),
    dcc.Graph(id='main-plot')
])
@app.callback(
    Output('main-plot', 'figure'),
    Input('x-dropdown', 'value'))
def update_figure(x_selector):
    fig = px.scatter_3d(df, x='sepal_length', y='sepal_width', z='petal_width',  color='species')
    fig.update_layout(uirevision='constant')
    return fig
    
app.run_server(debug=True, use_reloader=False)

This is what i'm observing:

I can tell that the uirevision is doing something since the viewpoint is not completely reset after the callback, but it is still very imprecise. Is there something I'm missing or is this the expected behavior?

首先运行 issue 中的最小 Python Dash 复现代码，并观察更改下拉菜单后的 3D 散点图。调查布局设置 uirevision 如何影响各次 callback 之间的 3D 视角；完成的标准是 callback 后视角保持一致，同时不破坏所演示的绘图行为。