when set zns=true, Dialog don't show .is it a bug?
Dialog zns
<script>zns =false</script>
import zim from "https://zimjs.org/cdn/018/zim_physics.js";
new zim.Frame(FIT, 1280, 720, clear, black, ready);
function ready() {
var dialog=new zim.Dialog({
width: 250,
height: 150,
words: 'hello!',
dialogType: "rectangle",
tailType: "line",
fill: false,
size: 24,
font: "comic",
color: white,
backgroundColor: black,
borderColor: red,
borderWidth: 4,
corner: 10,
padding: 10,
paddingV: 10,
tailH: 'center',
tailV: 'bottom',
tailShiftV: -20,
arrows: false
}).center();
}