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- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 3.0.7
* Operating System version: Mac OS
* Java version: 8

### Steps to reproduce this issue

1. set dubbo.protocol.port=30880
2. define dubbo service to export
3. create an @Bean to invoke dubbo reference
4. start up spring boot application
5. service export port is 30880, metadata service export port is 20880

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

### Expected Behavior

metadata service and instance export port is 30880

### Actual Behavior

metadata service and instance export port is 20880

### Issue code debug
![image](https://user-images.githubusercontent.com/7418602/169072305-1b0c83ab-0407-4bc0-aa1a-387c475d82f0.png)
![image](https://user-images.githubusercontent.com/7418602/169070767-406c3daa-ef0b-4b1a-89ef-44fb1cbcfa4f.png)
![image](https://user-images.githubusercontent.com/7418602/169071049-4607808e-9958-4f8d-888c-5f05135e2fbb.png)
![image](https://user-images.githubusercontent.com/7418602/169070937-8ac15446-5947-4a1f-8a2e-eba5c55e579f.png)


import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.ArgumentConfig;
import org.apache.dubbo.config.MethodConfig;
import org.apache.dubbo.config.ProtocolConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.ServiceConfig;
import org.apache.dubbo.metadata.MetadataService;
import org.apache.dubbo.rpc.Protocol;
import org.apache.dubbo.rpc.ProtocolServer;
import org.apache.dubbo.rpc.model.ApplicationModel;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import static java.util.Collections.emptyList;
import static org.apache.dubbo.common.constants.CommonConstants.CORE_THREADS_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.DUBBO_PROTOCOL;
import static org.apache.dubbo.common.constants.CommonConstants.METADATA_SERVICE_PORT_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.METADATA_SERVICE_PROTOCOL_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.THREADPOOL_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.THREADS_KEY;
/**
 * Export metadata service
 */
public class ConfigurableMetadataServiceExporter {