Back in January before the devaluation, I had successfully set up a Plan B award for EDI-EWR, flying last week. It said "I class requested". A couple of days before the flight I got an e-mail stating that my upgrade was not yet processed and that I'd be placed on the upgrade standby list. At T-24 I checked the upgrade standby list. There were a few people on it, but my name was missing. Also, my reservation had changed to "R class requested". We had a delay getting to EDI and then got stuck in the international arrivals hallway for ~45 minutes because an international departure just started boarding. By the time we got to the gate, the flight was departing in 20 minutes (too late to even try to get PR1 status) and all first class seats were occupied. The upgrade list showed 2 people had been upgraded. My name still was not on the list.
FWIW, the same thing happened in CLE the week prior for a short haul flight (I class switched to R, not added to standby list automatically).