TestFlight Subscription Upgrade Handling

Looking for assistance in managing subscription upgrades for TestFlight users.

I have a few monthly subscriptions, 30days, each with a different set of available features, 1 with all, and 1 with fewer. (All are in proper order and grouped in App Store connection subscriptions)

subscribing seems to be working fine, and purchasing an upgrade is going ok.

what is not: reflecting the upgraded plan in app (currently reflects it will start in 30days when current subscription expires)

I’m lead to believe this will be resolved with a live app in App Store, that will then handle prorating, terminate the old plan and immediately start the new one.

looking for help getting TestFlight to show immediate upgrades.