Review comment

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>

releasenotes/notes/fix-instmap-from-target-f38962c3fd03e5d3.yaml

@@ -1,5 +1,7 @@
 ---
 fixes:
   - |
-    Fix a bug that :meth:`.InstructionScheduleMap.has_custom_gate` returns always
-    True when the inst map is created by :class:`.Target`.
+    Fixed an issue with the :meth:`.InstructionScheduleMap.has_custom_gate` method,
+    where it would always return ``True`` when the :class:`~.InstructionScheduleMap`
+    object was created by :class:`.Target`.
+    Fixed `#9595 <https://github.com/Qiskit/qiskit-terra/issues/9595>`__

test/python/transpiler/test_target.py

@@ -1254,6 +1254,11 @@ def test_default_instmap_has_no_custom_gate(self):
         inst_map = target.instruction_schedule_map()
         self.assertTrue(inst_map.has_custom_gate())
 
+        empty = InstructionProperties()
+        target.update_instruction_properties(instruction="sx", qargs=(0,), properties=empty)
+        inst_map = target.instruction_schedule_map()
+        self.assertFalse(inst_map.has_custom_gate())
+
 
 class TestGlobalVariableWidthOperations(QiskitTestCase):
     def setUp(self):