序列化问题 获取对象的属性值为空

dubbo 2.7.12
接口的返回值为RpcResponse>
WaterFallMaterialDTO extend MaterialBaseBase
WaterFallMaterialDTO对象中的属性获取为空 MaterialBaseBase 的属性对象不存在 （PS:使用json 打印出来）
有大佬知道为啥吗？

Start with a minimal Dubbo 2.7.12 reproduction using RpcResponse> and the WaterFallMaterialDTO/MaterialBaseBase inheritance described in the report. Inspect the serialization and deserialization path for inherited properties, then verify whether the base attributes are present in the returned object and JSON output.

Written by the indexing model from the issue text.