Fotos somes ao remover filtro o input

Na parte de Pipes, quando remove o filtro do input as fotos vão sumindo aos poucos.

<div class="text-center mt-3 mb-3">
  <form>
    <input
      class="rounded"
      placeholder="Search..."
      autofocus
      (keyup)="filter = $event.target.value"/>
  </form>
</div>
<app-photos [photos]="photos | filterByDescription: filter"></app-photos>

import { Pipe, PipeTransform } from '@angular/core';
import { Photo } from '../photo/photo';

@Pipe({
  name: 'filterByDescription'
})
export class FilterByDescription implements PipeTransform {

  transform(photos: Photo[], descriptionQuery: string): Photo[] {
    console.log(photos);
    descriptionQuery = descriptionQuery.trim().toLowerCase();
    if (descriptionQuery) {
      return photos.filter(photo => photo.description.toLowerCase().includes(descriptionQuery));
    } else {
      return photos;
    }
  }

}