Angular ngbTypeahead doesn't reset value of input on blur

I'm using the bootstrap ngbTypeahead of Angular2+ and I want to clean the input when lose focus and no item ware selected.

But the value doesn't clean when the typeahead shows options to select, even if I lose the input focus and dont select any item.

Like This:

HTML:

<input type="text"
        id="obj"
        formControlName="obj"
        class="form-control"
        [class.is-invalid]="searchFailed"
        [ngbTypeahead]="filter"
        (selectItem)="selectObj($event.item)"
        (blur)="blurObj()" />

Typescript:

filter = (text$: Observable<string>) => {
    return text$.pipe(
        debounceTime(200),
        distinctUntilChanged(),
        tap(() => this.objSelected = null),
        switchMap( (term: string) => {
          if(term.length < 3) {            
            return [];
          } else {
            this.searching = true;
            return this.service.filter(term as string)
              .pipe(
                tap(() => this.searchFailed = false),
                catchError(() => {
                    this.searchFailed = true;
                    this.searching = false;
                    return [];
                })
              );
          }
        }),
        tap(() => this.searching = false)
    );
}

selectObj(obj: any) {
    this.objSelected = obj;
}

blurObj() {
    if(!this.objSelected) {
      this.form.get('obj').setValue('');
    }
}

This strange thing happens too:

Running Sample: https://stackblitz.com/edit/angular-ivy-spzwkm

PS: Type 3 or more characteres to test.

The solution that I used was override the function dismissPopup() of NgbTypeahead.

Like this:

import { NgbTypeahead } from '@ng-bootstrap/ng-bootstrap';

constructor(...) {
  NgbTypeahead.prototype.dismissPopup = function() {
    if (this.isPopupOpen()) {
      this._closePopup();
      if (this._elementRef.nativeElement.value !== '') {
        this._writeInputValue(this._inputValueBackup);
      }
    }
  }
}

Running Sample: https://stackblitz.com/edit/angular-ivy-i8omg9