The layers order within the Legend is not updated if the order of the layers on the map is changed.

Solución alternativa

Add the additional code to reflect the changes within the Legend.

Uncomment line 39-58 in the codepen sample to see the changes:

if(true){

     LegendViewModel.prototype._addActiveLayerInfo = function(e, t) {

       if (this._isLayerActive(t) && -1 === this.activeLayerInfos.indexOf(e)) {

         var r = e.parent;

         if(r){ 

          if(-1 === r.children.indexOf(e)){

           r.children.push(e)

          };

          this._sortActiveLayerInfos(r.children)

         }else{ 

          this.activeLayerInfos.add(e);

          this._sortActiveLayerInfos(this.activeLayerInfos);

         }

       }

     }

    }

Pasos para reproducir