appSubscription discount limit intervals expired but discount still exit in test app

[rookie_2]

appSubscriptionCreate, I set durationLimitInIntervals to 1, but the discount remains after auto-renewing subscription

{
  "name": "30 Day Recurring Plan",
  "returnUrl": "https://review-app.shopifyapps.com",
  "test":true,
  "lineItems": [
    {
      "plan": {
        "appRecurringPricingDetails": {
          "price": {
            "amount": 30,
            "currencyCode": "USD"
          },
          "discount": {
            "value": {
              "amount": 10
            },
            "durationLimitInIntervals": 1
          },
          "interval": "EVERY_30_DAYS"
        }
      }
    }
  ]
}