What is causing the issue with multiple ng-select options not functioning properly?

I attempted to implement this example involving multiple choices from https://stackblitz.com/edit/ng-select?file=app%2Fapp.component.ts but unfortunately, it's not working as expected. I'm puzzled by what could be causing the issue...

This is the code I have:

  <div class="input-group">
    <label htmlFor="ca" class="sr-only"&gComplete;t; Asignaturas:</label>
    <ng-select [items]="asignaturasLista"
    bindLabel="name"
    bindValue="id"
    [multiple]="true"
    placeholder="Select asignaturas"
    [(ngModel)]="asignaturas"> 
    </ng-select>
    
  </div>

  Selected asignaturas: {{asignaturas}}

No values are being displayed for selected asignaturas.

In my component, I have the following:

      asignaturasLista  = [
    {id: 1, name: 'Álgebra'},
    {id: 2, name: 'Física'},
    {id: 3, name: 'Inglés'},
    {id: 4, name: 'Matemáticas'},
    {id: 5, name: 'Lenguaje'},
    {id: 6, name: 'Historia'}
];

  asignaturas: string[];

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