Upgrading subscription not reflected in getCustomerInfo

Platform: iOS (Ionic/Angular)
Environment: Sandbox

Problem description
When user upgrades from a monthly subscription to an annual subscription, the upgrade is not reflected in getCustomerInfo() until the current subscription period expires and the new subscription becomes active.

I have own paywall screen and wanna show that new subscription will be active from __date__.

Apart from that I tried to reload app, invalidate cache and make sync. Also tried to request customerInfo from API ( but it doesn’t return any sub info ).