protobuf package question

- [*] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 3.2.3（org.apache.dubbo）
* Operating System version: macOS Monterey
* Java version: 1.8

### Steps to reproduce this issue

1. 定义protobuf，package xxx，java_package = yyy
2. 使用reflection，获得的方法名字是xxx.method1 xxx.method2 ....
3. 原生GRPC调用xxx.method1，返回12 UNIMPLEMENTED Service not found

3.1.X没有这个问题

Pls. provide [GitHub address] to reproduce this issue.

### Expected Behavior
原生GRPC调用xxx.method1，执行method1方法。

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```