Ilja, can you please PM me cpanel and admin access details? I'll take a look at the issue. As we cannot reproduce that on our side as well.
Also what about
Forum topic replies
Content setting in the newsfeed? Is it checked
{"create:user_join":true,"create:user_edit":true,"create:avatar-change":true,"create:user-comment":true,"*:friend_add":true,"create:forum-topic":true,"forum-post:forum-topic":true}
Can you click on the value field, it should expand and show more content?
Maybe these items should be false?
It seems I fixed the problem somehow. I've disabled and enabled forum items in Newsfeed module settings. And found that your mentioned parameter has changed to
{"create:user_join":true,"create:user_edit":true,"create:avatar-change":true,"create:user-comment":true,"*:friend_add":true,"*:group":true,"*:link":true,"*:video_comments":true,"create:forum-topic":true,"forum-post:forum-topic":true,"*:event":true,"*:photo_comments,*:multiple_photo_upload":true,"*:profile-cover":true,"*:question":true,"*:blog-post":true,"*:birthday":true}
Afterwards forum replies started appearing on a newsfeed.