Two pages appear in pdf output

When I try to output a pdf, I find that as long as the height of the output image is greater than 414, the pdf file will be two pages.

1. height=414

import plotly.express as px
import plotly.graph_objects as go


df = px.data.iris()

fig = px.scatter(df, x="sepal_width", y="sepal_length", color="species",
            facet_col="species")
fig.show()
fig.write_image('iris_scatter.pdf', height=414)

2. height=415

import plotly.express as px
import plotly.graph_objects as go


df = px.data.iris()

fig = px.scatter(df, x="sepal_width", y="sepal_length", color="species",
            facet_col="species")
fig.show()
fig.write_image('iris_scatter.pdf', height=415)

Height 415 seems to break through some limitations that prevent the image from displaying on one page.

No source files or tests are named in the report. Start by running the provided Python reproduction with heights 414 and 415 and compare the generated PDF page counts and dimensions. Done means PDF output remains on one page when the image height exceeds 414, with the existing reproduction confirming the fix.