I found a weird bug. I often reply to comments from the WP admin interface (specifically this page: /wp-admin/edit-comments.php) and I've never had any issues but something changed recently (possibly with one of the recent wpDiscuz updates) and I've noticed that whenever I reply using the admin page instead of directly in wpDiscuz thread, my comment is basically invisible. It's in the database just fine and appears correctly when linked to directly (with something like #comment-39208) but otherwise it doesn't automatically appear in the list of comments under a post. I found out that if I go to edit the comment in the WP interface and just re-save it (even without changing anything), it fixes the issue for that particular comment and it starts appearing normally.

I thought this might have been because I was still on WP 5.7.3 but I tried it on another one of my sites where I'm on the latest WP and wpDiscuz versions and the bug is there also. 

Any ideas? Let me know if you have trouble replicating it or need more information.