MAGETWO-64644: CMS Pages get removed from Store Hierarchy when saved

Author: sevos1984

app/code/Magento/Ui/view/base/web/js/form/components/fieldset.js

@@ -22,7 +22,7 @@ define([
             opened: false,
             level: 0,
             visible: true,
-            initializeFieldsetDataByDefault: false,
+            initializeFieldsetDataByDefault: false,    /* Data in some fieldsets should be initialized before open */
             disabled: false,
             listens: {
                 'opened': 'onVisibilityChange'
@@ -81,7 +81,7 @@ define([
                 'loading':  this.onContentLoading,
                 'error':  this.onChildrenError
             });
-            this._wasOpened = true;
+
             if (this.disabled) {
                 try {
                     elem.disabled(true);