Here’s tweet #635083280166035456, a reply, identified as such by means of the in_reply_to_screen_name attribute, which does not reference the original tweet it replies to by means of the in_reply_to_status_id attribute.
Is it expected ? The tweets reference documentation explicitly specifies that any reply shall include an in_reply_to_status_id attribute. Apparently, this is not always the case.
May I suggest the documentation to be changed in order to reflect this behaviour ?