diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index 328dda4a6a71..5e69bcb57d7f 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -1028,7 +1028,7 @@ def axhspan(self, ymin, ymax, xmin=0, xmax=1, **kwargs):
# For Rectangles and non-separable transforms, add_patch can be buggy
# and update the x limits even though it shouldn't do so for an
# yaxis_transformed patch, so undo that update.
- ix = self.dataLim.intervalx
+ ix = self.dataLim.intervalx.copy()
mx = self.dataLim.minposx
self.add_patch(p)
self.dataLim.intervalx = ix
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 48121ee04939..13c181b68492 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -8250,10 +8250,10 @@ def test_relative_ticklabel_sizes(size):
def test_multiplot_autoscale():
fig = plt.figure()
ax1, ax2 = fig.subplots(2, 1, sharex='all')
- ax1.scatter([1, 2, 3, 4], [2, 3, 2, 3])
+ ax1.plot([18000, 18250, 18500, 18750], [2, 3, 2, 3])
ax2.axhspan(-5, 5)
xlim = ax1.get_xlim()
- assert np.allclose(xlim, [0.5, 4.5])
+ assert np.allclose(xlim, [18000, 18800])
def test_sharing_does_not_link_positions():
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