Dubbo 3.0.5 Provider 接收参数为 Null

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## Ask your question here
hello：
I defined the service API interface with IDL, but the parameter received by the Provider is null；

## Service config
spring.profiles.active=local
server.port = 8081
spring.application.name=xxxxxxx
recommend.service.version=1.0.0
management.endpoint.health.show-details=always
management.server.ssl.enabled=false

## dubbo config
dubbo.scan.base-packages=com.mx.yoho.coordination
dubbo.protocol.name=dubbo
dubbo.protocol.port=8082
dubbo.registry.address=zookeeper://127.0.0.1:2181
dubbo.registry.file=${user.home}/dubbo-cache/${spring.application.name}/dubbo.cache

do i need add the config "dubbo.protocol.serialization=protobuf" in the properties file ? i have try to add it, will meet more serialization issue.

Start by reproducing the IDL-defined service with Dubbo 3.0.5 and the service configuration shown, focusing on the Provider's null parameter. Compare the default Dubbo serialization with the attempted protobuf setting and record the resulting serialization errors. Done means the Provider receives the expected non-null parameter without introducing serialization failures.

Written by the indexing model from the issue text.