HarmonyOS 数据同步问题

@Observed
class ClassA {
  public id: number;
  public c: number;
  public bClass: ClassB

  constructor(c: number) {
    this.id = IDNext++
    this.c = c;
    this.bClass = new ClassB(this.id)
  }
}

class ClassB {
  public b: number;

  constructor(b: number) {
    this.b = b;
  }
}

let IDNext: number = 1

@Component
struct ViewA {
  @ObjectLink a: ClassA;

  build() {
    Button(`classB.b= ${this.a.bClass ? this.a.bClass.b : "undefined"}`)
      .width(320)
      .margin(10)
      .onClick(() => {
        this.a.bClass.b += 1;
      })
  }
}

@Entry
@Component
struct Index {
  @State arrA: ClassA[] = [new ClassA(0), new ClassA(1)]

  build() {
    Column() {
      ForEach(this.arrA, (item: ClassA) => {
        ViewA({ a: item })
      })

      Button(`给arrA[0]的classB重新赋值`)
        .width(320)
        .margin(10)
        .onClick(() => {
          this.arrA[0].bClass = new ClassB(999)
          this.arrA[1].bClass = new ClassB(998)
        })
    }
  }
}