it can't be closed as the tick for question was removed.
Whenever there is a white empty speech bubble then it is not a question and hence no options for helpful or correct answer or assumed answered to close a discussion.
This type of content is foreseen for announcements and open discussions that cannot have a single answer.
And some moderators remove this tick instead of locking or rejecting the discussion if they believe the question is just basic and the OP could have found the answer himself by reading the docu, F1 or exisiting SCN content.
