---- Replace the Entity#a(AxisAlignedBB) method with this

    public void a(AxisAlignedBB axisalignedbb) {
        // Changes start - block invalid bounding boxes
    	// Fix: Do not allocate if not required.
        double a = axisalignedbb.a,
                b = axisalignedbb.b,
                c = axisalignedbb.c,
                d = axisalignedbb.d,
                e = axisalignedbb.e,
                f = axisalignedbb.f;
        if (d - a > 64 || d - a < 0 || e - b > 64 || e - b < 0 || f - c > 64 || f - c < 0) {
    		// This should rarely happen!
        	assignFixedAABB(a, b, c, d, e, f);
        } else {
        	this.boundingBox = axisalignedbb;
        }
        // Changes end
    }

    // Changes start - block invalid bounding boxes
	private void assignFixedAABB(double a, double b, double c, double d, double e,
			double f) {
		d = clamp(d, a, a + 64);

		e = clamp(e, b, b+64);

		f = clamp(f, c, c+64);
		this.boundingBox = new AxisAlignedBB(a, b, c, d, e, f);
	}

    private double clamp(double d, double min, double max) {
    	if (d < min) return min;
    	if (d > max) return max;
    	return d;
    }
    // Changes end