Thanks, rooivalk. Somewhat off-topic, but I will report the result.

I called Delta, since it's an 006 ticket, and told them that a segment was missing when I pulled up the itinerary on their web site. The agent said, oh I see that your flight is KUL-XXX-YYY-ZZZ-KUL-RGN. I said, no, it starts in RGN and the first segment is missing.

He then said, oh, I see that it's RGN-KUL-XXX-YYY-ZZZ-KUL-RGN. Everything is fine, the itinerary is intact. I said, then why did your first reading tell me that it was only five segments, starting in KUL? He said, "I looked at a different screen." I replied, well, which is the right screen, and how do I know that the MH check-in agent in RGN will see the "right screen"? He said, don't worry, I see the record of your ticket and all six segments are there.

So I guess I am OK. Worst case, I will sort it out at T-48h when I can check-in on-line. But annoying.