No provider available issue

When initiated together by consumers and providers
```java
private void doSubscribe(final URL url, final NotifyListener listener, final Set serviceNames) {
execute(namingService -> {
if (isServiceNamesWithCompatibleMode(url)) {
List allCorrespondingInstanceList = new ArrayList<>();

/**
* Get all instances with serviceNames to avoid instance overwrite and but with empty instance mentioned
* in https://github.com/apache/dubbo/issues/5885 and https://github.com/apache/dubbo/issues/5899
*
* namingService.getAllInstances with {@link org.apache.dubbo.registry.support.AbstractRegistry#registryUrl}
* default {@link DEFAULT_GROUP}
*
* in https://github.com/apache/dubbo/issues/5978
*/
for (String serviceName : serviceNames) {
List instances = namingService.getAllInstances(serviceName,
getUrl().getParameter(GROUP_KEY, Constants.DEFAULT_GROUP));
NacosInstanceManageUtil.initOrRefreshServiceInstanceList(serviceName, instances);
allCorrespondingInstanceList.addAll(instances);
}
notifySubscriber(url, listener, allCorrespondingInstanceList);
for (String serviceName : serviceNames) {
subscribeEventListener(serviceName, url, listener);
}
} else {
List instances = new LinkedList<>();
for (String serviceName : serviceNames) {
instances.addAll(namingService.getAllInstances(serviceName
, getUrl().getParameter(GROUP_KEY, Constants.DEFAULT_GROUP)));
notifySubscriber(url, listener, instances);
subscribeEventListener(serviceName, url, listener);
}
}

});
}
```

after consumer run
```java
for (String serviceName : serviceNames) {
List instances = namingService.getAllInstances(serviceName,
getUrl().getParameter(GROUP_KEY, Constants.DEFAULT_GROUP));
NacosInstanceManageUtil.initOrRefreshServiceInstanceList(serviceName, instances);
allCorrespondingInstanceList.addAll(instances);
}
notifySubscriber(url, listener, allCorrespondingInstanceList);
```

the field forbidden in DynamicDirectory become true，
at this time, provider register to nacos, and then consumer run
```java
for (String serviceName : serviceNames) {
subscribeEventListener(serviceName, url, listener);
}
```
so it seems that consumer miss nacos notify because provider registed before consumer subscribe it on nacos.
cause forbidden is always true.
这段代码之间，生产者注册到了nacos，此时，由于消费者还没向nacos监听服务，所以收不到通知，导致这个情况下forbidden属性不通过外力干涉，一直是true，导致调用no provider，我通过debug能复现此问题，不确定我的分析是否合理？