diff --git a/galleries/users_explain/axes/axes_units.py b/galleries/users_explain/axes/axes_units.py
index 6b486f007a12..a9159abe33ce 100644
--- a/galleries/users_explain/axes/axes_units.py
+++ b/galleries/users_explain/axes/axes_units.py
@@ -236,7 +236,7 @@
x = np.arange(100)
ax = axs[0]
ax.plot(x, x)
-label = f'Converter: {ax.xaxis.converter}\n '
+label = f'Converter: {ax.xaxis.get_converter()}\n '
label += f'Locator: {ax.xaxis.get_major_locator()}\n'
label += f'Formatter: {ax.xaxis.get_major_formatter()}\n'
ax.set_xlabel(label)
@@ -245,7 +245,7 @@
time = np.arange('1980-01-01', '1980-06-25', dtype='datetime64[D]')
x = np.arange(len(time))
ax.plot(time, x)
-label = f'Converter: {ax.xaxis.converter}\n '
+label = f'Converter: {ax.xaxis.get_converter()}\n '
label += f'Locator: {ax.xaxis.get_major_locator()}\n'
label += f'Formatter: {ax.xaxis.get_major_formatter()}\n'
ax.set_xlabel(label)
@@ -255,7 +255,7 @@
names = list(data.keys())
values = list(data.values())
ax.plot(names, values)
-label = f'Converter: {ax.xaxis.converter}\n '
+label = f'Converter: {ax.xaxis.get_converter()}\n '
label += f'Locator: {ax.xaxis.get_major_locator()}\n'
label += f'Formatter: {ax.xaxis.get_major_formatter()}\n'
ax.set_xlabel(label)
diff --git a/lib/matplotlib/category.py b/lib/matplotlib/category.py
index 4ac2379ea5f5..14cffd914a2a 100644
--- a/lib/matplotlib/category.py
+++ b/lib/matplotlib/category.py
@@ -227,7 +227,8 @@ def update(self, data):
# Register the converter with Matplotlib's unit framework
-units.registry[str] = StrCategoryConverter()
-units.registry[np.str_] = StrCategoryConverter()
-units.registry[bytes] = StrCategoryConverter()
-units.registry[np.bytes_] = StrCategoryConverter()
+# Intentionally set to a single instance
+units.registry[str] = \
+ units.registry[np.str_] = \
+ units.registry[bytes] = \
+ units.registry[np.bytes_] = StrCategoryConverter()
diff --git a/lib/matplotlib/tests/test_category.py b/lib/matplotlib/tests/test_category.py
index fd4aec88b574..b724e5839c4d 100644
--- a/lib/matplotlib/tests/test_category.py
+++ b/lib/matplotlib/tests/test_category.py
@@ -246,6 +246,14 @@ def test_update_plot(self, plotter):
axis_test(ax.xaxis, ['a', 'b', 'd', 'c'])
axis_test(ax.yaxis, ['e', 'g', 'f', 'a', 'b', 'd'])
+ def test_update_plot_heterogenous_plotter(self):
+ ax = plt.figure().subplots()
+ ax.scatter(['a', 'b'], ['e', 'g'])
+ ax.plot(['a', 'b', 'd'], ['f', 'a', 'b'])
+ ax.bar(['b', 'c', 'd'], ['g', 'e', 'd'])
+ axis_test(ax.xaxis, ['a', 'b', 'd', 'c'])
+ axis_test(ax.yaxis, ['e', 'g', 'f', 'a', 'b', 'd'])
+
failing_test_cases = [("mixed", ['A', 3.14]),
("number integer", ['1', 1]),
("string integer", ['42', 42]),
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