[Python] ax.scatter(x, y, z, s=None) rises error in projection='3d' mode

Strange behavior of ax.scatter() in projection='3d' mode.

This code

import matplotlib.pyplot as plt

fig = plt.figure()
ax = plt.axes(projection='3d')
ax.scatter(0,0,0, s=None)
plt.show()


Rises an error: ValueError: s must be a scalar, or float array-like with the same size as x and y.

Although, without parameter s or with s equals to some specific value everything works fine.

Any ideas?

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