[Bug]: ax.scatter([], [], clip_on=False, label=...) renders a ghost marker at the origin/corner when combined with specific styles/limits #32219

Bug summary

When passing an empty dataset to ax.scatter() with clip_on=False and a label, calling ax.legend() causes a marker artifact to render incorrectly at the bottom-left edge of the plot. Toggling clip_on=True makes the artifact disappear.

Code for reproduction

import matplotlib.pyplot as plt
import scienceplots

plt.style.use("science")

fig, ax = plt.subplots()

ax.set_xlim(1, 180)
ax.set_ylim(9.90, 10.15)

# Empty scatter with clip_on=False and a legend label
ax.scatter(
    [], [], 
    color="red", 
    s=50, 
    facecolors="none", 
    edgecolors="red", 
    linewidths=1,
    label="Outlier", 
    clip_on=False
)

ax.legend()
plt.show()

Actual outcome

clip_on=False => artifact in the lower left corner

Expected outcome

clip_on=True => no artifact in the lower left corner

Additional information

Happens also when exporting as pgf and embedding into a Latex document.

Operating system

Arch

Matplotlib Version

3.10.9

Matplotlib Backend

module://matplotlib_inline.backend_inline

Python version

3.13.14

Jupyter version

7.6.2

Installation

pixi