[6.x] Fix bard undos (#14506)

Author: jackmcdade

resources/js/components/fieldtypes/bard/Set.vue

@@ -350,6 +350,7 @@ export default {
             () => data_get(this.publishContainer.values.value, this.fieldPathPrefix),
             (values) => {
 				if (! values) return;
+                if (JSON.stringify(values) === JSON.stringify(this.node.attrs.values)) return;
 
                 this.updateAttributes({ values });
             },