Comment by StillBored

Occam's razor.

This is a bug with ""several potentially catastrophic failure scenarios". Yet, its not been fixed in the ~10 years since it first flew. Nor is it the first, there have been a number of fairly critical bugs on this airplane that took a long time to diagnose before changes were submitted for certification.

So, In ~10 years and many major revisions of the aircraft, multiple re-certifications, etc none of them have bothered to fix it. One might argue they are afraid of changing the software because it might cause other catastrophic failures, but that leads down a thought process just as severe.