Why does angular run change detection Checks after a component is detached from the view?

A simple component using OnPush change detection. Detached the component in ngOnInit after the first cycle. Even after doing so, the life cycle hooks used here are being called when a button click from a different component triggers the change.

Would love to have any help understanding this!

The logs fired from the hooks can be seen below:

Comments

[GaurangDhorda]

Thats because setTimeout internally called ngZone and detect changes for components. Same things are applied for async pipe too!