Can't draw spike line across subplots with make_subplots in 4.0.0

After upgrading to plotly 4.0.0, I can't see how to create a spike line across shared axes created with make_subplots.

Previously I was using code like this:

from plotly.tools import make_subplots
from plotly.io import write_html

fig = make_subplots(rows=4, cols=1, shared_xaxes=True)
x_vals = list(range(10))
y_vals = [x**2 for x in x_vals]
fig.add_scatter(x=x_vals, y=y_vals, row=1, col=1)
fig.add_scatter(x=x_vals, y=y_vals, row=2, col=1)
fig.add_scatter(x=x_vals, y=y_vals, row=3, col=1)
fig.add_scatter(x=x_vals, y=y_vals, row=4, col=1)

fig.update_xaxes(spikemode='across+marker')

write_html(fig, 'out.html', auto_open=True)

The resulting figure showed spike lines across axes because only one x axis was created:

But in 4.0, multiple x axes are created so the spike line no longer draws across all subplots:

Is there any way around this? Thanks!

Comienza con la reproducción de Python proporcionada usando make_subplots, shared_xaxes y fig.update_xaxes(spikemode='across+marker'). Compara la configuración de los ejes de los subplots generada en Plotly 4.0 con el comportamiento anterior de un solo eje. Se considera terminado cuando se identifique una forma compatible de hacer que la línea de spike abarque todos los subplots compartidos, o se documente esa limitación y su solución alternativa.