diff --git a/wagtail/tests/test_revision_model.py b/wagtail/tests/test_revision_model.py
index 66f5c4ef64..18852ddd69 100644
--- a/wagtail/tests/test_revision_model.py
+++ b/wagtail/tests/test_revision_model.py
@@ -6,6 +6,7 @@ from freezegun import freeze_time
 
 from wagtail.models import Page, Revision, get_default_page_content_type
 from wagtail.test.testapp.models import (
+    FullFeaturedSnippet,
     RevisableGrandChildModel,
     RevisableModel,
     SimplePage,
@@ -178,3 +179,25 @@ class TestRevisableModel(TestCase):
             "SubmittedRevisionsManager is deprecated and will be removed in a future release.",
         ):
             self.assertEqual(list(Revision.submitted_revisions.all()), [revision])
+
+    def test_revision_cascade_on_object_delete(self):
+        page = self.create_page()
+        full_featured_snippet = FullFeaturedSnippet.objects.create(text="foo")
+        cases = [
+            # Tuple of (instance, cascades)
+            # For models that define a GenericRelation to Revision, the revision
+            # should be deleted when the instance is deleted.
+            (page, True),
+            (full_featured_snippet, True),
+            (self.instance, False),  # No GenericRelation to Revision
+        ]
+        for instance, cascades in cases:
+            with self.subTest(instance=instance):
+                revision = instance.save_revision()
+                query = {
+                    "base_content_type": instance.get_base_content_type(),
+                    "object_id": str(instance.pk),
+                }
+                self.assertEqual(Revision.objects.filter(**query).first(), revision)
+                instance.delete()
+                self.assertIs(Revision.objects.filter(**query).exists(), not cascades)
diff --git a/wagtail/tests/test_workflow.py b/wagtail/tests/test_workflow.py
index d4a385bb4d..1ce3acdc02 100644
--- a/wagtail/tests/test_workflow.py
+++ b/wagtail/tests/test_workflow.py
@@ -449,6 +449,19 @@ class TestPageWorkflows(WagtailTestUtils, TestCase):
         self.assertIsNone(self.object.locked_at)
         self.assertIsNone(self.object.locked_by)
 
+    def test_workflow_state_cascade_on_object_delete(self, cascades=True):
+        data = self.start_workflow()
+        query = {
+            "base_content_type": self.object.get_base_content_type(),
+            "object_id": str(self.object.pk),
+        }
+        self.assertEqual(
+            WorkflowState.objects.filter(**query).first(),
+            data["workflow_state"],
+        )
+        self.object.delete()
+        self.assertIs(WorkflowState.objects.filter(**query).exists(), not cascades)
+
 
 class TestSnippetWorkflows(TestPageWorkflows):
     fixtures = None
@@ -479,3 +492,10 @@ class TestSnippetWorkflowsNotLockable(TestSnippetWorkflows):
         self.assertEqual(workflow_state.workflow, workflow)
         self.assertEqual(workflow_state.content_object, self.object)
         self.assertEqual(workflow_state.status, "in_progress")
+
+    def test_workflow_state_cascade_on_object_delete(self):
+        # We expect the cascade to not happen as the model does not define
+        # a GenericRelation to WorkflowState. However, workflows should still
+        # work as expected.
+        # See https://github.com/wagtail/wagtail/issues/11300 for more details.
+        return super().test_workflow_state_cascade_on_object_delete(cascades=False)