path.sketch doesn't apply to PolyCollection

[story645]

Bug report

Bug summary
PolyCollection lines aren't affected by changes to the path.sketch rcparam, even though patches
are-the docs say that polycollection defaults to patch RC params

Code for reproduction

import numpy as np

import matplotlib.collections as mcollections
import matplotlib.patches as mpatches
import matplotlib.pyplot as plt
from matplotlib import rcParams


rcParams['path.sketch'] = (.5, 25, 20)

fig, (ax1, ax2) = plt.subplots(ncols=2)
f1 = mpatches.Rectangle((.25,.25), .5, .5, facecolor='white', edgecolor='C0', linewidth=2)
ax1.add_patch(f1)

verts = np.array([[[1,-1], [1,1], [2.4, 1.5], [2.4, -.5]],
                 [[-.4,1.5],[-.4,-.5],[1,-1],[1,1]],
                 [[-.4, 1.5], [1, 2],[2.4, 1.5], [1,1]]])
verts2 = verts*.25 + [.3]
p = mcollections.PolyCollection(np.vstack([verts, verts2]), facecolor='white', edgecolor='C0', linewidth=2)
ax2.add_collection(p)

Matplotlib version

• Matplotlib version (import matplotlib; print(matplotlib.__version__)): 3.3.4
• Matplotlib backend (print(matplotlib.get_backend())): jupyter inline

[oscargus]

It seems to be an issue with the rendering as p.get_sketch_params() returns the correct value.

[oscargus]

It also seems to be an issue with the agg-backend. Saving as PDF or SVG gives the correct result.