Bug summary

Plotting a scatter where c= is a sequence with the initial value being nan will have the legend entry showing text only

Code for reproduction

import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(0, 1, 50)
y = np.linspace(-1, 1, 50)
c = np.linspace(10, 100, 50)
c_nan = np.linspace(10, 100, 50)
c_nan[0] = np.nan

fig, ax = plt.subplots()
line1 = ax.scatter(x, y, c=c, s=12, label='Test 1')
line2 = ax.scatter(x * 2, y * 2, c=c_nan, s=12, label='Test 2')
ax.legend()
plt.show()

Actual outcome

Expected outcome

Have each legend entry show a symbol

Additional information

No response

Operating system

WIndows

Matplotlib Version

3.6.3

Matplotlib Backend

Qt5Agg

Python version

3.10.x

Jupyter version

No response

Installation

pip