Tuba,
I see what you are talking about and the only way to fix this I have found is with this work around (lines 18 - 24):
view.when(function() {
var layerList = new LayerList({
view: view
});
view.ui.add(layerList, "bottom-right");
var sketchViewModel = new SketchViewModel({
view: view,
layer: tempGraphicsLayer,
pointSymbol: pointSymbol,
polylineSymbol: polylineSymbol,
polygonSymbol: polygonSymbol
});
setTimeout(function(){
layerList.operationalItems.items.map(function(item){
if(!item.layer.title && item.layer.type === "graphics"){
item.layer.listMode = "hide";
}
});
}, 200);
You really need to log a bug with esri tech support on this.