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Description
The following code creates a 2D subplot in the left column and a 3D subplot in the right column. Adding a vertical line to the 2D subplot fails if a Scatter3d has been added to the 3D subplot.
Another bug shown in this example is that add_vline does not add any annotations if the plot is empty.
from plotly import subplots
specs = [
[{}, {'type': 'scene', 'rowspan': 1}],
]
fig = subplots.make_subplots(rows=1, cols=2, specs=specs)
# Add dummy data
# If both of these are commented out, fig.add_vline does nothing
# If neither are commented out, fig.add_vline raises a PlotlyKeyError
# If fig.add_scatter3d is commented out, the figure is generated successfully
fig.add_scatter(x=[0, 1], y=[0, 1], row=1, col=1)
fig.add_scatter3d(x=[0, 1], y=[0, 1], z=[0, 1], row=1, col=2)
# Add vertical line to left (2D) subplots only
fig.add_vline(x=2, col=1) # Raises PlotlyKeyError(Plotly version 5.9.0)