diff --git a/lms/djangoapps/grades/tasks.py b/lms/djangoapps/grades/tasks.py
index bf0b8993f1..3b504e61eb 100644
--- a/lms/djangoapps/grades/tasks.py
+++ b/lms/djangoapps/grades/tasks.py
@@ -24,6 +24,8 @@ from common.djangoapps.util.date_utils import from_timestamp
 from lms.djangoapps.course_blocks.api import get_course_blocks
 from lms.djangoapps.courseware.model_data import get_score
 from lms.djangoapps.grades.config.models import ComputeGradesSetting
+from openedx.core.djangoapps.content.block_structure.api import clear_course_from_cache
+from openedx.core.djangoapps.content.block_structure.exceptions import UsageKeyNotInBlockStructure
 from openedx.core.djangoapps.content.course_overviews.models import \
     CourseOverview  # lint-amnesty, pylint: disable=unused-import
 from xmodule.modulestore.django import modulestore  # lint-amnesty, pylint: disable=wrong-import-order
@@ -44,6 +46,7 @@ KNOWN_RETRY_ERRORS = (  # Errors we expect occasionally, should be resolved on r
     DatabaseError,
     ValidationError,
     DatabaseNotReadyError,
+    UsageKeyNotInBlockStructure,
 )
 RECALCULATE_GRADE_DELAY_SECONDS = 2  # to prevent excessive _has_db_updated failures. See TNL-6424.
 RETRY_DELAY_SECONDS = 40
@@ -315,7 +318,8 @@ def _update_subsection_grades(
     student = User.objects.get(id=user_id)
     store = modulestore()
     with store.bulk_operations(course_key):
-        course_structure = get_course_blocks(student, store.make_course_usage_key(course_key))
+        course_usage_key = store.make_course_usage_key(course_key)
+        course_structure = get_course_blocks(student, course_usage_key)
         subsections_to_update = course_structure.get_transformer_block_field(
             scored_block_usage_key,
             GradesTransformer,
@@ -323,6 +327,17 @@ def _update_subsection_grades(
             set(),
         )
 
+        # Clear the course cache if access is restricted and course blocks are
+        # cached without the restricted blocks.
+        if not subsections_to_update:
+            clear_course_from_cache(course_usage_key.course_key)
+            raise UsageKeyNotInBlockStructure(
+                "Scored block usage_key '{0}' is not found in the block_structure with root '{1}'".format(
+                    str(scored_block_usage_key),
+                    str(course_usage_key)
+                )
+            )
+
         course = store.get_course(course_key, depth=0)
         subsection_grade_factory = SubsectionGradeFactory(student, course, course_structure)
 
diff --git a/lms/djangoapps/grades/tests/test_tasks.py b/lms/djangoapps/grades/tests/test_tasks.py
index 4c4f60d731..4dfd2dbef9 100644
--- a/lms/djangoapps/grades/tests/test_tasks.py
+++ b/lms/djangoapps/grades/tests/test_tasks.py
@@ -14,14 +14,13 @@ import pytz
 from django.db.utils import IntegrityError
 from django.utils import timezone
 from edx_toggles.toggles.testutils import override_waffle_flag
-from xmodule.modulestore import ModuleStoreEnum
-from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
-from xmodule.modulestore.tests.factories import CourseFactory, BlockFactory, check_mongo_calls
+from stevedore.extension import Extension, ExtensionManager
 
 from common.djangoapps.student.models import CourseEnrollment, anonymous_id_for_user
 from common.djangoapps.student.tests.factories import UserFactory
 from common.djangoapps.track.event_transaction_utils import create_new_event_transaction_id, get_event_transaction_id
 from common.djangoapps.util.date_utils import to_timestamp
+from lms.djangoapps.courseware.tests.test_group_access import MemoryUserPartitionScheme
 from lms.djangoapps.grades import tasks
 from lms.djangoapps.grades.config.waffle import ENFORCE_FREEZE_GRADE_AFTER_COURSE_END
 from lms.djangoapps.grades.constants import ScoreDatabaseTableEnum
@@ -36,6 +35,10 @@ from lms.djangoapps.grades.tasks import (
     recalculate_subsection_grade_v3
 )
 from openedx.core.djangoapps.content.block_structure.exceptions import BlockStructureNotFound
+from xmodule.modulestore import ModuleStoreEnum
+from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
+from xmodule.modulestore.tests.factories import BlockFactory, CourseFactory, check_mongo_calls
+from xmodule.partitions.partitions import USER_PARTITION_SCHEME_NAMESPACE, Group, UserPartition
 
 from .utils import mock_get_score
 
@@ -209,6 +212,48 @@ class RecalculateSubsectionGradeTest(HasCourseWithProblemsMixin, ModuleStoreTest
             {self.sequential.location, accessible_seq.location},
         )
 
+    @patch('lms.djangoapps.grades.signals.signals.SUBSECTION_SCORE_CHANGED.send')
+    def test_problem_block_with_restricted_access(self, mock_subsection_signal):
+        """
+        Test that `SUBSECTION_SCORE_CHANGED` is sent for a restricted problem block.
+        """
+        self.set_up_course()
+
+        UserPartition.scheme_extensions = ExtensionManager.make_test_instance(
+            [
+                Extension(
+                    "memory",
+                    USER_PARTITION_SCHEME_NAMESPACE,
+                    MemoryUserPartitionScheme(),
+                    None
+                )
+            ],
+            namespace=USER_PARTITION_SCHEME_NAMESPACE
+        )
+        verified_group = Group(60, 'verified')
+        verified_partition = UserPartition(
+            0,
+            'Verified Partition',
+            'Verified Learners',
+            [verified_group],
+            scheme=UserPartition.get_scheme("memory"),
+        )
+
+        accessible_seq = BlockFactory.create(parent=self.chapter, category='sequential')
+        restricted_problem = BlockFactory.create(
+            parent=accessible_seq,
+            category='problem',
+            display_name='Restricted Problem',
+            group_access={verified_partition.id: [verified_group.id]}
+        )
+
+        self.recalculate_subsection_grade_kwargs['usage_id'] = str(restricted_problem.location)
+        verified_partition.scheme.set_group_for_user(self.user, verified_partition, verified_group)
+
+        self._apply_recalculate_subsection_grade()
+        assert mock_subsection_signal.call_count == 1
+        UserPartition.scheme_extensions = None
+
     @ddt.data(
         (ModuleStoreEnum.Type.split, 2, 41),
     )