orcamoment

I'm sure this has already been asked somewhere, but I've been searching and stumped on this for a while! I'm doing the pre-genin exercises before the leaf academy test and was about to do the body flicker jutsu exercise when the scroll just disappeared from my inventory. I literally can't find it anywhere. I'm assuming this is a bug but lmk if I'm just a total noob who missed something obvious! If it's the latter then my apologies in advance!