They didn't miss it. They caught it, but decided to release P6 anyway. The schedule, you know.

(My boss has a cartoon posted, showing the space shuttle on the launch pad - upside down. A manager is telling an engineer, "Don't be coming to me with problems now. A schedule is a schedule!")

I'm sure this program will kick butt when the patch is released, but for now, I'm going back to P5, too.