Topics are not getting associated with forum
Try:

drush state:set comment.maintain_entity_statistics TRUE


Explanation:

core/modules/comment/src/CommentStatistics.php in the update() function says this:

// Allow bulk updates and inserts to temporarily disable the maintenance of
// the {comment_entity_statistics} table.
if (!$this-&gt;state-&gt;get('comment.maintain_entity_statistics')) {
  return;
}


In my case, somehow this was not set, causing this function to bail out and not update the comment_entity_statistics table. Drupal needs this table updated to display the proper forum posts.

"drush state:get comment.maintain_entity_statistics" can be used to check if this is already set.