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From the 2014 Case Book ...

2.26.3 SITUATION: Runner A1 is advancing towards B's goal line and is very near the sideline.
a. A1 advances into B's end zone while holding the ball outside the sideline plane; or
b. A1 dives toward the end zone, but is hit by B1 which causes him to land out of bounds beyond the goal-line extended.
A1's last contact with the ground was short of the goal line. In both cases the ball breaks the plane of B's goal-line extended.
RULING:
• In (a), it is a touchdown because A1 was touching inbounds when the ball broke the plane of the goal-line extended.
• In (b) since A1 was not touching inbounds and was short of the goal line when he was hit, it is not a touchdown even though the ball did break the goal-line plane extended. The ball is spotted at the inbounds spot on the yard line where the foremost point of the ball crossed the sideline plane when A1 was driven out of bounds.

Sorry, I missed where this was posted on Page 2 of the thread.