### 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" />`
```

}
    @Parameter(key = QOS_PORT)
    public Integer getQosPort() {
        return qosPort;
    }
    public void setQosPort(Integer qosPort) {
        this.qosPort = qosPort;
    }
    @Parameter(key = ACCEPT_FOREIGN_IP)
    public Boolean getQosAcceptForeignIp() {
        return qosAcceptForeignIp;
    }
    public void setQosAcceptForeignIp(Boolean qosAcceptForeignIp) {
        this.qosAcceptForeignIp = qosAcceptForeignIp;
    }
    /**
     * The format is the same as the springboot, including: getQosEnableCompatible(), getQosPortCompatible(), getQosAcceptForeignIpCompatible().
     *
     * @return
     */
    @Parameter(key = "qos-enable", excluded = true)
    public Boolean getQosEnableCompatible() {
        return getQosEnable();
    }
    public void setQosEnableCompatible(Boolean qosEnable) {
        setQosEnable(qosEnable);
    }
    @Parameter(key = "qos-host", excluded = true)
    public String getQosHostCompatible() {
        return getQosHost();