Reply to thread doesn't result in notification/alert, and the thread and subforum do not get bolded as expected

[MaximilianKohler]

Affected version

2.2.17

I made a number of comments here reporting multiple scenarios where the buggy behavior occurs: https://xenforo.com/community/threads/not-receiving-some-alerts.189866/post-1730352

This may be one cause:

Oh, I think I may have thought of a possible cause:

1. OP makes a thread.
2. User2 reacts to the thread and writes a comment that goes into the mod queue.
3. OP gets an alert for the reaction, clicks it, and visits the thread which resets some internal "mark thread as read date".
4. Moderator approves the comment replying to the thread.

Expected behavior would be for 4. to result in another alert, and the thread and subforum to bold. But possibly due to the way Xenforo is calculating "thread read" is causing this problem.

If that's correct, a solution may be for Xenforo to trigger alerts and "new post" indications after certain moderator actions.

I noticed that sometimes there's a checkbox for an admin action to "notify people subscribed to thread", so my guess is that's not a default when it should be, especially since that checkbox is only sometimes available. You could change it to make that the default behavior and change the checkbox where it exists to "don't notify people subscribed to thread".