The LOD fouls were hulled out of the untimed down rule several years ago by the NFHS, and I believe nearly simultaneously by the NCAA, as a result of a game-ending play in a Louisiana. The play went sorta' like this:
(1) A scores to go up by 2 with 0:05 remaining in game;
(2) B turns the free kick return into a rugby scrum;
(3) at A's 15, B2 heaves the ball forward as he was about to be tackled;
(4) B3 catches the airborne heave in A's endzone, clock reads 0:00;
(5) A needs to take the IFP penalty to negate a TD;
(6) ball moved to A's 20, B -now A- is given an untimed down;
(7) Hans ,the European exchange student, enters the game and kicks
state championship game winning 37 yd field goal;
(8) Hans gets a date with the prom queen!
IMHO, removing the untimed down from LOD penalty left a buried glitch. It surfaced it's ugly head twice this year - once in in Oka/Mich NCAA game and again in an Ill. NFHS state championship - I believe - and in this OP. IMHO, the easy removal of this glitch is to add to (NFHS) 3-3-4b3 : "....unless the foul causes a change of possession." The officials in the two mentioned games inadvertently enforced common sense solutions that ,by rule, were wrong. Any other suggestions on making those common sense solutions correct by rule???........