ZoneAwareClusterInvoker ClassCastException

[liuzhaozhao]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: 2.7.7
• Operating System version: windows 10
• Java version: 1.8

现象：
在测试cluster: zone-aware时，ZoneAwareClusterInvoker类的doInvoke方法抛出了java.lang.ClassCastException，异常信息为：
java.lang.ClassCastException: org.apache.dubbo.registry.integration.RegistryDirectory$InvokerDelegate cannot be cast to org.apache.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker
at org.apache.dubbo.rpc.cluster.support.registry.ZoneAwareClusterInvoker.doInvoke(ZoneAwareClusterInvoker.java:63)

配置：
Provider#1
server:
port: 8090
dubbo:
scan:
base-packages: cn.service.test.api
application:
name: dubbo-service
config:
multiple: true
protocol:
name: dubbo
port: 2080
threads: 200
provider:
version: 1.0.0
registry:
check: false
timeout: 20000
use-as-config-center: false
address: zookeeper://localhost:2181
zone: zone-1

Provider#2
server:
port: 8091
dubbo:
scan:
base-packages: cn.service.test.api
application:
name: dubbo-service
config:
multiple: true
protocol:
name: dubbo
port: 2081
threads: 200
provider:
version: 1.0.0
registry:
check: false
timeout: 20000
use-as-config-center: false
address: nacos://nacos.ym:80
zone: zone-2

Consumer
server:
port: 8092
dubbo:
scan:
base-packages: cn.service.test.api
application:
name: dubbo-client
protocol:
name: dubbo
port: 2082
threads: 200
config:
multiple: true
provider:
version: 1.0.0
registries:
zone1:
address: zookeeper://localhost:2181
timeout: 20000
use-as-config-center: false
cluster: zone-aware
zone2:
address: nacos://nacos.ym:80
timeout: 20000
preferred: true
use-as-config-center: false
cluster: zone-aware

问题
目前dubbo的文档中未发现zone-aware的使用方式，请问是配置错误导致吗？

[cityiron]

I see this problem too. Who can give me an example?

[qixiaobo]

e0d031e#diff-63d1649b1513afec0955a32f1d991e86L62
This code fix