AC-2020:Error:Dynamic rows component behaves incorrectly when a new element is added

Author: RaghavendraTirumalasetti

app/code/Magento/Ui/view/base/web/js/dynamic-rows/dynamic-rows-grid.js

@@ -259,7 +259,6 @@ define([
             }
 
             this.source.set(this.dataScope + '.' + this.index + '.' + this.recordData().length, obj);
-            obj.position = this.recordData().length - 1;
         },
 
         /**

app/code/Magento/Ui/view/base/web/js/dynamic-rows/dynamic-rows.js

@@ -801,7 +801,7 @@ define([
             var max = 0,
                 pos;
 
-            this.elems.each(function (record) {
+            this.recordData.each(function (record) {
                 pos = ~~record.position;
                 pos > max ? max = pos : false;
             });