HarmonyOS 嵌套Class状态观察问题

参考demo

@ObservedV2
class Son {
  @Trace age: string = "100";
}
class Father {
  son: Son = new Son();
}
@Entry
@Component
struct Index {
  father: Father = new Father();
  build() {
    Column() {
      // 当点击改变age时，Text组件会刷新
      Text(`${this.father.son.age}`)
        .onClick(() => {
          this.father.son.age = "102";
        })
      TextInput({text: `${this.father.son.age}`, placeholder: "aaa"})
    }
  }
}