Is there callback received based on periodic subscription or only on change in subscribe() interface in android VHAL?

Question

In Android VHAL, whether the interface subscribe(IVehicleCallback callback, vec options) provides callback to system service only when there is a change or based on subscription frequency if the VehiclePropertyChangeMode CONTINUOUS?

Reference link - https://source.android.com/docs/automotive/vhal/properties

I have seen only when there is change in subscribed property we get a callback

For example I am subscribing for 5 continuous properties for every 1 second, I am expecting a callback with 5 data every 1 sec, Can anyone explain me more on this?