dubbo服务注册到nacos有元数据显示(接口、版本号)，但springcloud服务注册到nacos，元数据为空

元数据示例：

dubbo.protocols.rest.port=9090
dubbo.metadata-service.urls=[ "dubbo://192.168.118.10:20880/org.springframework.cloud.alibaba.dubbo.service.DubboMetadataService?anyhost=true&application=spring-cloud-alibaba-dubbo-provider&bind.ip=192.168.118.10&bind.port=20880&default.deprecated=false&default.dynamic=false&default.register=true&deprecated=false&dubbo=2.0.2&dynamic=false&generic=false&group=spring-cloud-alibaba-dubbo-provider&interface=org.springframework.cloud.alibaba.dubbo.service.DubboMetadataService&methods=getAllServiceKeys,getServiceRestMetadata,getExportedURLs,getAllExportedURLs&pid=7412&register=true&release=2.7.1&revision=1.0.0&side=provider&timestamp=1559723835426&version=1.0.0" ]
dubbo.protocols.dubbo.port=20880
preserved.register.source=SPRING_CLOUD