iOS14.0.1 subscribe fail

Code Block swift func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        print("sub-update\(transactions.count)")
        guard let fobj = transactions.first else { return }
            
        switch fobj.transactionState {
        case .purchased:
            print("sub-purchased ")
            DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
                self.finsihTrans(trans: transactions)
            }
        case .restored:
            print("sub-restored")
            finsihTrans(trans: transactions)
        case .failed:
            print("sub-failed ")
            finsihTrans(trans: transactions)
        case .purchasing:
            print("sub-purchaing")
        default:
            finsihTrans(trans: transactions)
        }
    }
    
    func finsihTrans(trans: [SKPaymentTransaction]) {
        for t in trans {
            print("sub-finished \(t.transactionIdentifier)-state=-\(t.transactionState)")
            SKPaymentQueue.default().finishTransaction(t)
        }
    }

in iOS13 ,when a user click subscribe button, func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) will callback a purchasing transaction,after user input password, call back a purchased transaction. However,in iOS14.0.1 ,after a user click subcribe button, only callback a restored transaction,that lead subscribe fail alway.Has anyone encountered this kind of problem, please help