Why is the rxjs stream not changing?

Question

Angular

Available:

public events$: BehaviorSubject<IEvent[]> = new BehaviorSubject<IEvent[]>([]);

Data is requested and forwarded to events$ :

this.load().subscribe((response) => {
      this.events$.next(response);
    });

There is a function that changes the data in the stream:

public checkAll() {
    this.events$.pipe(
      map((events: IEvent[]) => {
        return events.map((event: IEvent) => {
          event.checked_export = !event.checked_export;
          return event;
        });
      })
    );
  }

Why, if you subscribe to events$ , nothing changes after calling the checkAll()

function As it seems to me, you need to do this.events$ = this.events$.pipe()...or forward the mapped object:this.events$.next(mapped)