Webhooks Not Being Received Properly in Sandbox Environment

I am currently using Android subscriptions in the sandbox environment. When a user makes a purchase, the initial_purchase event is received correctly. However, events such as renew, cancellation, and expiration are not being received. Is this expected behavior in the sandbox environment?

For reference, below is the webhook I received:

{
  "event": {
    "event_timestamp_ms": 1724862639635,
    "product_id": "premium:5-monthly",
    "period_type": "NORMAL",
    "purchased_at_ms": 1724862633772,
    "expiration_at_ms": 1724862929764,
    "environment": "SANDBOX",
    "entitlement_id": null,
    "entitlement_ids": [
      "premium"
    ],
    "presented_offering_id": "default",
    "transaction_id": "GPA.3346-5354-2391-53417",
    "original_transaction_id": "GPA.3346-5354-2391-53417",
    "is_family_share": false,
    "country_code": "KR",
    "app_user_id": "671e13db-492e-4779-a39e-a9f4cd89c245",
    "aliases": [
      "671e13db-492e-4779-a39e-a9f4cd89c245"
    ],
    "original_app_user_id": "671e13db-492e-4779-a39e-a9f4cd89c245",
    "currency": "KRW",
    "price": 5.189,
    "price_in_purchased_currency": 6900,
    "subscriber_attributes": {
      "$attConsentStatus": {
        "value": "notDetermined",
        "updated_at_ms": 1724559204867
      }
    },
    "store": "PLAY_STORE",
    "takehome_percentage": 0.85,
    "offer_code": null,
    "tax_percentage": 0.0909,
    "commission_percentage": 0.1364,
    "renewal_number": 1,
    "type": "INITIAL_PURCHASE",
    "id": "6A33D390-764E-4CA1-90F6-925E4DD6344F",
    "app_id": "app9705dc3e48"
  },
  "api_version": "1.0"
}

subscribers api 

{
  "request_date": "2024-08-28T16:30:41Z",
  "request_date_ms": 1724862641115,
  "subscriber": {
    "entitlements": {
      "premium": {
        "expires_date": "2024-08-28T16:35:29Z",
        "grace_period_expires_date": null,
        "product_identifier": "premium",
        "product_plan_identifier": "5-monthly",
        "purchase_date": "2024-08-28T16:30:33Z"
      }
    },
    "first_seen": "2024-08-25T04:00:56Z",
    "last_seen": "2024-08-28T16:22:22Z",
    "management_url": "https://play.google.com/store/account/subscriptions",
    "non_subscriptions": {},
    "original_app_user_id": "671e13db-492e-4779-a39e-a9f4cd89c245",
    "original_application_version": "1.0",
    "original_purchase_date": "2013-08-01T07:00:00Z",
    "other_purchases": {},
    "subscriptions": {
      "ios_monthly_subscription": {
        "auto_resume_date": null,
        "billing_issues_detected_at": null,
        "expires_date": "2024-08-25T05:13:20Z",
        "grace_period_expires_date": null,
        "is_sandbox": true,
        "original_purchase_date": "2024-08-25T04:13:20Z",
        "ownership_type": "PURCHASED",
        "period_type": "normal",
        "purchase_date": "2024-08-25T05:08:20Z",
        "refunded_at": null,
        "store": "app_store",
        "store_transaction_id": "2000000694980037",
        "unsubscribe_detected_at": "2024-08-25T05:08:06Z"
      },
      "membership": {
        "auto_resume_date": null,
        "billing_issues_detected_at": null,
        "expires_date": "2024-08-24T16:37:32Z",
        "grace_period_expires_date": null,
        "is_sandbox": true,
        "original_purchase_date": "2024-08-12T17:15:11Z",
        "ownership_type": "PURCHASED",
        "period_type": "normal",
        "purchase_date": "2024-08-24T16:32:32Z",
        "refunded_at": null,
        "store": "app_store",
        "store_transaction_id": "2000000694851722",
        "unsubscribe_detected_at": "2024-08-25T04:13:27Z"
      },
      "premium": {
        "auto_resume_date": null,
        "billing_issues_detected_at": null,
        "expires_date": "2024-08-28T16:35:29Z",
        "grace_period_expires_date": null,
        "is_sandbox": true,
        "original_purchase_date": "2024-08-28T16:30:33Z",
        "period_type": "normal",
        "product_plan_identifier": "5-monthly",
        "purchase_date": "2024-08-28T16:30:33Z",
        "refunded_at": null,
        "store": "play_store",
        "store_transaction_id": "GPA.3346-5354-2391-53417",
        "unsubscribe_detected_at": null
      }
    }
  }
}