I solved this finally. I am not using the parents data for $sendurl but the comment's data. Don't know why gidgreen did it differently... In qa-event-notify.php:
change line: $sendurl=qa_q_path($question['postid'], $question['title'], true, $parent['basetype'], $parent['postid']);
to:
$sendurl=qa_q_path($question['postid'], $question['title'], true, 'C', $params['postid']);
Now the anchor is showing up.
This is also the solution for the initial question on top!