Android IAP acknowledgedState =1 after subscription expire

Question

• I have been testing subscriptions with android IAP.
• When i let a subscription run it's course (six 5-minute intervals) the subscription expires as expected
• When i repurchase the subscription, the acknowledgedState = 1 during verification before acknowledging the subscription.
• although this new sub purchase's acknowledgeState = 1, the subscription is not recognized as such on my device and the subscription inevitably reverts.
• When i cancel the subscription, then wait a while (30-60 minutes at least), the acknowledgeState = 0 and i am able to then acknowledge the purchase and finish the transaction successfully.