Created Unassigned: Recurring issues with Body.Text and Body.Html with BODY[1.1] NIL [2390]

I have had this issue for a while now. A message will download successfully, but when I try to access either Body.Text or Body.Html, all I will get is BODY[1.2.1] NIL for text and BODY[1.2.1] NIL for HTML. I'm not sure if it is the way the multipart message is structured with the text, html, and attachment parts or what, but it is tough to have approximately 2% of messages fail to parse correctly. I have attached a copy of a message that is refusing to parse.

Has anybody had similar problems downloading messages?