Nacos Service Discovery can't work normally

[horizonzy]

Environment

• Dubbo version: master

Steps to reproduce this issue

This issue should after #7723 merged.

1. modify dubbo-demo-xml-provider spring file as follow:

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">

    <dubbo:application name="demo-provider" metadata-type="remote">
        <dubbo:parameter key="mapping-type" value="config"/>
    </dubbo:application>

    <dubbo:config-center address="nacos://127.0.0.1:8848"/>
    <dubbo:metadata-report address="nacos://127.0.0.1:8848"/>
    <dubbo:registry id="registry1" address="nacos://127.0.0.1:8848?registry-type=service"/>

    <dubbo:protocol name="dubbo" port="-1"/>

    <bean id="demoService" class="org.apache.dubbo.demo.provider.DemoServiceImpl"/>
    <bean id="greetingService" class="org.apache.dubbo.demo.provider.GreetingServiceImpl"/>

    <dubbo:service interface="org.apache.dubbo.demo.DemoService" timeout="3000" ref="demoService" registry="registry1"/>
    <dubbo:service version="1.0.0" group="greeting" timeout="5000" interface="org.apache.dubbo.demo.GreetingService"
                   ref="greetingService"/>

</beans>

2. modify dubbo-demo-xml-consumer spring file as follow:

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">

    <dubbo:application name="demo-consumer" >
        <dubbo:parameter key="mapping-type" value="config"/>
        <dubbo:parameter key="enable-auto-migration" value="true"/>
    </dubbo:application>

    <dubbo:metadata-report address="nacos://127.0.1:8848"/>

    <dubbo:registry address="nacos://127.0.0.1:8848"/>

    <dubbo:reference id="demoService" check="true"
                     interface="org.apache.dubbo.demo.DemoService"/>

    <dubbo:reference version="1.0.0" group="greeting" id="greetingService" check="false"
                     interface="org.apache.dubbo.demo.GreetingService"/>

</beans>

3. Run provider and consumer
4. Result: consumer can't discovery provider.