fix(runtime-core): fix use of non-existent-in-prod internal property in defineProperty trap

fix #5710

packages/runtime-core/src/componentPublicInstance.ts

@@ -458,7 +458,7 @@ export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
   ) {
     if (descriptor.get != null) {
       // invalidate key cache of a getter based property #5417
-      target.$.accessCache[key] = 0
+      target._.accessCache![key] = 0
     } else if (hasOwn(descriptor, 'value')) {
       this.set!(target, key, descriptor.value, null)
     }