Angular component not destroying after moving to another component

I have an angular component which is implementing OnDestroy method.

export class MyComponent implements OnInit, OnDestroy {
constructor(private elementRef: ElementRef,
ngOnInit() {
    ngOnDestroy(): void {

However, when I move to another component even then I see that MyComponent is not destroying. I can see that apis used within MyComponent are still running.

Debugging Details:

When I move to another component MyComponent2 I see that OnDestroy from MyComponent is getting called.

However, if check the Network tab under developer tools I see that even after the execution of OnDestroy, all apis under MyComponent are still running.

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Please also note that MyComponent is only using promise for the services and I am not subscribing to any services.