HarmonyOS TextInput的text属性包含“�”时，输入框内容被异常清空

参考示例：

@Entry
@Component
struct Index {
  @State private inputText: string = ""
  @Prop @Watch('onTextUpdated') text: string = ""
  public maxLength: number = 6

  onTextUpdated() {
    this.inputText = this.sliceTools(this.text, this.maxLength)
  }

  sliceTools(str: string, maxLength: number): string {
    let res = "";
    for (const element of str) {
      console.info('输入：' + element)
      if (res.length < maxLength) {
        res = res + element
      }
    }
    return res;
  }

  build() {
    Column() {
      TextInput({ text: $$this.inputText })
        .onChange((value: string) => {
          this.text = value
        })
    }
  }
}