Angular Hot Reload doesn't destroy components?

[observant2]

https://codesandbox.io/s/black-snow-ip4be2?file=/src/app/timer/timer.component.ts

In this sandbox I tried to model how important unsubscribing is for rxjs observables. But it seems that when codesandbox hot reloads, it doesn't destroy the old component, therefore the console logs observables that should have been unsubscribed. Does this imply that every time I save, a new component gets created? Is this a bug or is there something about how codesandbox hot reloads code?