message: fix: prevent memory leak due to circular reference in vnodes
  fix
diff: @@ -133,6 +133,10 @@ export function lifecycleMixin (Vue: Class<Component>) {
  if (vm.$el) {
  vm.$el.__vue__ = null
  }
  + // release circular reference (#6759)
  + if (vm.$vnode) {
  + vm.$vnode.parent = null
  + }
  }
  }
  