Merge pull request #17510 from caiwukun/fix_legend_name_duplicate_rem…

…oval

fix: legend inverse bug

src/component/legend/LegendModel.ts

@@ -354,21 +354,27 @@ class LegendModel<Ops extends LegendOption = LegendOption> extends ComponentMode
         // which is convinient for user preparing option.
         const rawData = this.get('data') || potentialData;
 
+        const legendNameMap = zrUtil.createHashMap();
         const legendData = zrUtil.map(rawData, function (dataItem) {
             // Can be string or number
             if (zrUtil.isString(dataItem) || zrUtil.isNumber(dataItem)) {
                 dataItem = {
                     name: dataItem as string
                 };
             }
+            if (legendNameMap.get(dataItem.name)) {
+                // remove legend name duplicate
+                return null;
+            }
+            legendNameMap.set(dataItem.name, true);
             return new Model(dataItem, this, this.ecModel);
         }, this);
 
         /**
          * @type {Array.<module:echarts/model/Model>}
          * @private
          */
-        this._data = legendData;
+        this._data = zrUtil.filter(legendData, item => !!item);
     }
 
     getData() {