您可以使用selectedText属性，胁迫ion-select显示configObject的值。
在示例HTML中：

<ion-select
      [ngModel]="configObject.soundType"
      [selectedText]="configObject.soundType"
      interface="popover"
      (ionChange)="newSoundType($event)"
    >

Stackblitz link

Using carlosGlegaspi answer as base I managed to fix this although it feels like a hack.
instead of send directly an event I call a function first and I also send a reference to ion-select :

<ion-label>Sound Type</ion-label>
            <ion-select
          #ionSelect
      [ngModel]="configObject.soundType"
      [selectedText]="configObject.soundType"
      interface="popover"
      (ionChange)="newSoundType($event, ionSelect)"
    >

Then in the function I send the event but also reset the value of ionSelect

public emitNewSoundType(event: CustomEvent<IonSelect>, element: IonSelect): void {
    if (this.trainingConfig) {
      element.value = this.configObject.soundType;
    }
    this.newSoundType.emit(event);
  }

stackblitz with an example (using ionic3 because I could not bring ionic 4 to work with stackblitz) https://stackblitz.com/edit/ionic-select-problem-solution?file=pages%2Fhome%2Fhome.ts

objectConfig仍保留旧值，因为您尚未设置双向绑定，即[(value)]="objectConfig!.soundType"。

<ion-select
   [value]="order.order_status"
   [interface]="'popover'"
   (ionChange)="onStatusChange($event)"
>

...

onStatusChange($event) {

   ...your condition here...

   ...cancel like this...
   const temp = this.order.order_status;
   this.order.order_status = null;
   setTimeout( () => {
       this.order.order_status = temp;
   }, 200);

虽然很简陋但很管用。
离子4