### Environment

* Dubbo version: dubbo-registry-nacos 2.7.6
* Operating System version: Win10
* Java version: JAVA 8

### Steps to reproduce this issue
1 springboot  yml配置如下： 
registry:
     address: nacos://127.0.0.1:8848
     simplified: true
     group: dubbo-local
  metadata-report:
            address: nacos://127.0.0.1:8848
            group: dubbo-local

2 登陆nacos 1.2.1 控制台发现元数据 group配置生效，但是服务管理下的group依旧是DEFAULT_GROUP。

3 跟了下dubbo-registry-nacos 2.7.6的代码 发现在调用NamingService中 没有传入配置的group参数，使用的默认组参数 
 public void doRegister(URL url) {
        String serviceName = this.getServiceName(url);
        Instance instance = this.createInstance(url);
        this.execute((namingService) -> {
            namingService.registerInstance(serviceName, instance);
        });
    }

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

What do you expected from the above steps？

### Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```

int length = segments.length;
            if (length != 4) { 
                return false;
            }
            String category = segments[CATEGORY_INDEX];
            if (!categories.contains(category)) { 
                return false;
            }
            String serviceInterface = segments[SERVICE_INTERFACE_INDEX];
            
            if (!WILDCARD.equals(targetServiceInterface) &&
                    !StringUtils.isEquals(targetServiceInterface, serviceInterface)) {
                return false;
            }
            
            String version = segments[SERVICE_VERSION_INDEX];
            if (!WILDCARD.equals(targetVersion) && !StringUtils.isEquals(targetVersion, version)) {
                return false;
            }
            String group = segments[SERVICE_GROUP_INDEX];
            return group == null || WILDCARD.equals(targetGroup) || StringUtils.isEquals(targetGroup, group);
        });
    }
    private <T> void filterData(Collection<T> collection, NacosDataFilter<T> filter) {
        
        collection.removeIf(data -> !filter.accept(data));
    }
    @Deprecated
    private List<String> doGetServiceNames(URL url) {
        List<String> categories = getCategories(url);