Are we sure? It's possible we got a FP on opening day but I didn't think it was. I know for certain we rode either early or on opening day. We even had a malfunction on our ride and got to ride again due to this. It's why I recall our first ride so much. Same thing happened on our first ride on Guardians too, stopped, turned on lights, escorted off, and rerode when it started. Guardians was 100% on our AP preview day and when it happened I recall thinking, the same thing happened for our Runaway railway first ride. Though as my age I could misremember the Runaway details at this point.