### 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 setQosHostCompatible(String qosHost) {
        this.setQosHost(qosHost);
    }
    @Parameter(key = "qos-port", excluded = true)
    public Integer getQosPortCompatible() {
        return getQosPort();
    }
    public void setQosPortCompatible(Integer qosPort) {
        this.setQosPort(qosPort);
    }
    @Parameter(key = "qos-accept-foreign-ip", excluded = true)
    public Boolean getQosAcceptForeignIpCompatible() {
        return this.getQosAcceptForeignIp();
    }
    public void setQosAcceptForeignIpCompatible(Boolean qosAcceptForeignIp) {
        this.setQosAcceptForeignIp(qosAcceptForeignIp);
    }
    public Map<String, String> getParameters() {
        return parameters;
    }
    public void setParameters(Map<String, String> parameters) {
        this.parameters = parameters;
    }
    public String getShutwait() {
        return shutwait;
    }
    public void setShutwait(String shutwait) {
        System.setProperty(SHUTDOWN_WAIT_KEY, shutwait);
        this.shutwait = shutwait;