Fumble through the end zone

[Rick Vietti]

I saw the exact play described in a HS playoff game a couple of years ago.

B intercepts A's pass on B's 40 yard line and fumbles the ball on the 3 yard line going in and the ball goes through the end zone. Ball awarded back to A on the 20 yard line by rule.

This seemed unfair to me at the time and still seems to be a mystery on giving the ball back to the other team as the penalty for fumbling through the EZ. I would propose that a fumble through the endzone is a touchback but the ball given back to the fumbling team 1st down on the 20 yard line going in.

It seems like an unfair advantage for one team for the ball squirting straight ahead instead of out of bounds, left or right.