Clear cache undo manager

src/undo_manager/index.js

@@ -73,6 +73,9 @@ export default () => {
         on(object, v, opts) {
           !beforeCache && (beforeCache = object.previousAttributes());
           const opt = opts || v || {};
+          setTimeout(() => {
+            beforeCache = null;
+          });
           if (hasSkip(opt)) {
             return;
           } else {