A little confused about how IAP subscriptions

I am testing subscriptions on iOS, I use the SubscriptionManager class. It seems that as long as the user is subscribed, I get the receipt details (like in the demo) and I can get the receipt data. This is each time OnInitialized. However, it seems that once the subscription expires, I no longer get any data, why is that? I thought it's supposed to show the isExpired field as false and still get the data of the previous receipts. Or am I misunderstanding how it works?

 

You should no longer see the receipt if the subscription expires. isExpired does not look to be reliable.