diff --git a/Lib/test/test_unicodedata.py b/Lib/test/test_unicodedata.py
@@ -216,6 +216,12 @@ def test_issue29456(self):
         self.assertEqual(self.db.normalize('NFC', u11a7_str_a), u11a7_str_b)
         self.assertEqual(self.db.normalize('NFC', u11c3_str_a), u11c3_str_b)
 
+    def test_is_normalized_unicode_3_2_0(self):
+        for x in range(0x110000):
+            for form in ('NFC', 'NFD', 'NFKC', 'NFKD'):
+                normalized = self.db.ucd_3_2_0.normalize(form, chr(x))
+                self.assertTrue(self.db.ucd_3_2_0.is_normalized(form, normalized))
+
     def test_east_asian_width(self):
         eaw = self.db.east_asian_width
         self.assertRaises(TypeError, eaw, b'a')

diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-01-28-20-31-42.gh-issue-101372.8BcpCC.rst b/Misc/NEWS.d/next/Core and Builtins/2023-01-28-20-31-42.gh-issue-101372.8BcpCC.rst
@@ -0,0 +1,2 @@
+Fix :func:`~unicodedata.is_normalized` to properly handle the UCD 3.2.0
+cases. Patch by Dong-hee Na.
diff --git a/Modules/unicodedata.c b/Modules/unicodedata.c
@@ -800,7 +800,7 @@ is_normalized_quickcheck(PyObject *self, PyObject *input, bool nfc, bool k,
 {
     /* UCD 3.2.0 is requested, quickchecks must be disabled. */
     if (UCD_Check(self)) {
-        return NO;
+        return MAYBE;
     }
 
     if (PyUnicode_IS_ASCII(input)) {
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Fix :func:`~unicodedata.is_normalized` to properly handle the UCD 3.2.0
		cases. Patch by Dong-hee Na.