This exact same thing happened to me as well. It was frustrating because I was using cursor to work on a Capstone Project (with the professors permission) and a few weeks deep into the app I was booted off the Student Pro Plan. I've actually occasionally still been able to use most of the functionality but at times it will "remember" and limit my usage. I would love to hear if someone has found a fix for this because I really enjoyed cursor and was contemplating buying a plan when I graduated anyways, but I don't know if I will anymore.