plt.stackplot() does not work with 3.0.0

Something now breaks this code that used to work. Now, I have to call plt.subplots first and use stackplot on an axis object.

TypeError: stackplot() got multiple values for argument 'x'

from matplotlib import pyplot as plt
plt.stackplot([1,2,3], [1,2,3])

Should be equivalent to

fig, ax = plt.subplots()
ax.stackplot([1,2,3], [1,2,3])

Matplotlib version

Operating system:
Matplotlib version: 3.0.0
Matplotlib backend (print(matplotlib.get_backend())): 'module://ipykernel.pylab.backend_inline'
Python version: 3.6.6
Jupyter version (if applicable): 4.4.0
Other libraries:

Installed matplotlib using conda with default channel.

This is present in master as well, and worked w/ 2.2.3

#12293 also closes this.

Closed via #12293.

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