Responses to Private Messages seen on overview

If a user creates a new "Private Message" to members of it's own company, and if a response is made to that private message that the comment is not marked as private, the action is displayed on the project overview of all members of other companies, however when the link is clicked, the error message of "You do not have permissions to see that item" is displayed, the first line of the private message is displayed on the overview pages of the people who should not see that message.