Tall Cardboard Box Issues.

[Foxyas]

Entities inside of such boxes can still be hit by melee attacks if they hitbox is big enough.

my suggestion is to make a mixin in "Entity$isPickable" to make any entity "riding" in a invisible "seatEntity" be immune of the melee hitpoint;

@Override
public boolean isPickable() {
    // Prevents crosshairs, melee attacks, and raycasts from targeting the entity
    return !(this.getVehicle() instanceof SeatEntity) && super.isPickable();
}

@Override
public boolean canBeCollidedWith() {
    // Stops other entities/players from pushing or colliding into the entity
    return !(this.getVehicle() instanceof SeatEntity) && super.canBeCollidedWith();
}

@Override
public boolean canBeHitByProjectile() {
    // Lets arrows and projectiles pass straight through without hitting a bounding box
    return !(this.getVehicle() instanceof SeatEntity) && super.canBeHitByProjectile();
}