Merge pull request #18143 from edx/ai/EDUCATOR-2825-course-outline

Fix inconsistency progress between Unit and Course Outline.

openedx/features/course_experience/utils.py

@@ -91,7 +91,10 @@ def get_course_outline_block_tree(request, course_id):
                 if block['children'][idx]['resume_block'] is True:
                     block['resume_block'] = True
 
-            if len([child['complete'] for child in block['children'] if child['complete']]) == len(block['children']):
+            completable_blocks = [child for child in block['children']
+                                  if child['type'] != 'discussion']
+            if len([child['complete'] for child in block['children']
+                    if child['complete']]) == len(completable_blocks):
                 block['complete'] = True
 
     def mark_last_accessed(user, course_key, block):