@Component({
      selector: 'app-cmp',
      template: `
        @defer (on viewport) {
          <div>Complete state of the first defer block</div> <!--Parent Complete State-->

          @defer {
            <div>Complete state of the nested defer block</div> <!--Nested Complete State-->
          }
        } @placeholder {
          <div>Placeholder</div>
        }
      `,
    })
    class DummyComponent {}

    const createComponent = createComponentFactory({
      component: DummyComponent,
      deferBlockBehavior: DeferBlockBehavior.Manual,
    });

    it('should render the first nested complete state', async () => {
      // Arrange
      const spectator = createComponent();

      // Act
      // Renders the parent complete state
      const parentCompleteState = await spectator.deferBlock().renderComplete();

      // Renders the nested complete state
      await parentCompleteState.deferBlock().renderComplete();

      // Assert
      expect(spectator.element.outerHTML).toContain('nested defer block');
    });

TypeError: Cannot read properties of undefined (reading 'render')
    at http://localhost:9876/_karma_webpack_/webpack:/node_modules/@ngneat/spectator/fesm2022/ngneat-spectator.mjs:796:28
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@babel/runtime/helpers/esm/asyncToGenerator.js:3:1)
    at apply (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@babel/runtime/helpers/esm/asyncToGenerator.js:17:1)
    at _ZoneDelegate.invoke (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:369:28)
    at ProxyZoneSpec.onInvoke (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone-testing.js:2081:39)
    at _ZoneDelegate.invoke (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:368:34)
    at ZoneImpl.run (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:111:43)
    at apply (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:2538:40)
    at _ZoneDelegate.invokeTask (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:402:33)

`undefined (reading 'render')`

Angular 18.2.0
Spectator 19.0.0