SoCal
You are right. I logged into
https://www.flightschoolcandidates.gov and found that I have
"Training Not Completed"
against one entry. But there should have been only
one entry. There are two. The one 'not completed' I had completely forgotten about; it refers to another school which was using a UK instructor as their "agent" and he basically lost the I-20 (it was delivered to his home when he was abroad). I abandoned that process and changed to another school.
I will try to contact that school but I doubt they will communicate. They never did previously, only doing it via this instructor.
A pity U.S. Immigration are unable to access this info (they must have got some condensed version of it) and just end up sticking you into a room where some dumb person shouts at you across the room.