Question on betting over/under punch totals for Usyk vs Fury 2

If you bet on an over/under for punches thrown in a certain round, is the bet a wash/void if the fight doesn't make it to that round due to KO or DQ or does the under of that bet hit because its 0?

If you bet the under for total punches under 1030.5, does this still hit if there's a KO in the first round for ex? Is it a wash if the fight doesn't go the distance or does it still hit if there's only 10 punches thrown because of a KO in the first for ex?

Because the odds I'm getting are -115 for both the under of tyson throwing 530.5 punches and total punches under 1035.5, which seems insanely +EV given Tyson is 20 pounds heavier than the first
fight and he threw about 50 punches less than this in the first fight, and the total punches was also a lot less.

Does the betting sites just make $ because both the over and under are worse than even $ so as long as they get bets on both sides, they make $ even if the line is insanely off reality? I feel like I've gotta be missing something. Like why would anyone ever bet at worse than even $ on the over of punches in round 12 if they lose if it doesn't go that far for ex.

I'd like to bet the under on tyson punch total and total punch because it seems like this applies to the most contingencies possible for how the fight could go, but want to be sure I understand first. I'm using the sports book on ACR BTW.