When I try to sync purchases on one of my devices, I get the following error:
Error syncing purchases StoreTransaction(orderId=null, productIds=[plus_upgrade], type=INAPP, purchaseTime=1641997886514, purchaseToken=<redacted>, purchaseState=UNSPECIFIED_STATE, isAutoRenewing=null, signature=<redacted>, originalJson={"productId":"plus_upgrade","purchaseToken":"<redacted>","purchaseTime":1641997886514,"quantity":1,"developerPayload":null}, presentedOfferingIdentifier=null, storeUserID=null, purchaseType=GOOGLE_RESTORED_PURCHASE, marketplace=null, subscriptionOptionId=null, replacementMode=null). Error: PurchasesError(code=UnknownBackendError, underlyingErrorMessage=Backend Code: 7651 - The payment for this non-subscription product is not complete., message='There was an unknown backend error.')
On the Play Console, I see that this in-app purchase has been refunded and it has a proper order ID.
Any idea?