I’ve heard all the explanations but still don’t get the “must survive the ground” no-catch call. The TE caught the ball before the goal line, with his knee on the ground. If a DB had touched him down, it would’ve been a catch w/ no TD. But because he made what looked to be a “football move” to stretch across that goal line and bobbled the ball in the end zone, suddenly what was a clear catch was nullified. What am I missing?