### Environment

* Dubbo version: 2.7.5
* Operating System version: win10 or centos7
* Java version: 1.8.0
* Zookeeper version: 3.5.6

### Steps to reproduce this issue
My previous dubbo service version was 2.7.3. Today, I upgraded to 2.7.5. I found that the metadata can't be displayed all the time. The dubbo service registry in zookeeper, but zookeeper not /dubbo/metadata node path view.  If I switch back to 2.7.3 and 2.7.4.1, it can be displayed. Are there any bugs? I need help~~

xml-config:
`<dubbo:metadata-report address="zookeeper://192.168.11.100:2181?backup=192.168.11.105:2181" />`
```

public void setName(String name) {
        this.name = name;
        if (StringUtils.isEmpty(id)) {
            id = name;
        }
    }
    @Parameter(key = "application.version")
    public String getVersion() {
        return version;
    }
    public void setVersion(String version) {
        this.version = version;
    }
    public String getOwner() {
        return owner;
    }
    public void setOwner(String owner) {
        this.owner = owner;
    }
    public String getOrganization() {
        return organization;
    }
    public void setOrganization(String organization) {
        this.organization = organization;
    }
    public String getArchitecture() {
        return architecture;
    }
    public void setArchitecture(String architecture) {
        this.architecture = architecture;