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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)


Map<String, String> params = getApplicationConfig().getParameters();
            if (CollectionUtils.isNotEmptyMap(params)) {
                protocol = getApplicationConfig().getParameters().get(METADATA_SERVICE_PROTOCOL_KEY);
            }
        }
        return StringUtils.isNotEmpty(protocol) ? protocol : DUBBO_PROTOCOL;
    }
    private ServiceConfig<MetadataService> buildServiceConfig() {
        ApplicationConfig applicationConfig = getApplicationConfig();
        ServiceConfig<MetadataService> serviceConfig = new ServiceConfig<>();
        serviceConfig.setScopeModel(applicationModel.getInternalModule());
        serviceConfig.setApplication(applicationConfig);
        RegistryConfig registryConfig = new RegistryConfig("N/A");
        registryConfig.setId("internal-metadata-registry");
        serviceConfig.setRegistry(registryConfig);
        serviceConfig.setRegister(false);
        serviceConfig.setProtocol(generateMetadataProtocol());
        serviceConfig.setInterface(MetadataService.class);
        serviceConfig.setDelay(0);
        serviceConfig.setRef(metadataService);
        serviceConfig.setGroup(applicationConfig.getName());
        serviceConfig.setVersion(MetadataService.VERSION);
        serviceConfig.setMethods(generateMethodConfig());
        serviceConfig.setConnections(1); 
        serviceConfig.setExecutes(100); 
        Map<String, String> threadParams = new HashMap<>();
        threadParams.put(THREADPOOL_KEY, "cached");
        threadParams.put(THREADS_KEY, "100");
        threadParams.put(CORE_THREADS_KEY, "2");
        serviceConfig.setParameters(threadParams);