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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)


return serviceConfig;
    }
    /**
     * Generate Method Config for Service Discovery Metadata <p/>
     * <p>
     * Make {@link MetadataService} support argument callback,
     * used to notify {@link org.apache.dubbo.registry.client.ServiceInstance}'s
     * metadata change event
     *
     * @since 3.0
     */
    private List<MethodConfig> generateMethodConfig() {
        MethodConfig methodConfig = new MethodConfig();
        methodConfig.setName("getAndListenInstanceMetadata");
        ArgumentConfig argumentConfig = new ArgumentConfig();
        argumentConfig.setIndex(1);
        argumentConfig.setCallback(true);
        methodConfig.setArguments(Collections.singletonList(argumentConfig));
        return Collections.singletonList(methodConfig);
    }
    
    public void setMetadataService(MetadataServiceDelegation metadataService) {
        this.metadataService = metadataService;
    }
    
    public List<URL> getExportedURLs() {
        return serviceConfig != null ? serviceConfig.getExportedUrls() : emptyList();
    }
}