resetFallDistance() Called Twice When a Player Collides With Water

I was trying to investigate the bug that causes you to take damage when falling into one-block-deep water, and I came across the following in pocketmine\block\Water

Code:

public function onEntityCollide(Entity $entity){
    $entity->resetFallDistance();
    if($entity->fireTicks > 0){
        $entity->extinguish();
    }
    $entity->resetFallDistance();
}

Why is it that $entity->resetFallDistance() is called twice?