Webhook PRODUCT_CHANGE entitlement_ids is null

When changing a Stripe subscription the entitlement_ids in the PRODUCT_CHANGE webhook are always null. But all Stripe products are mapped to entitlements.

The webhook:

{
  "api_version": "1.0",
  "event": {
    "aliases": [
      "uQw121nienNLn6WAMns2abjPMAl2"
    ],
    "app_id": "app6e36463a7d",
    "app_user_id": "uQw121nienNLn6WAMns2abjPMAl2",
    "country_code": null,
    "currency": "EUR",
    "entitlement_id": null,
    "entitlement_ids": null,
    "environment": "SANDBOX",
    "event_timestamp_ms": 1632605983882,
    "expiration_at_ms": 1635186961000,
    "id": "061D6082-0653-41F8-ACF0-5575F696B4FA",
    "is_family_share": false,
    "new_product_id": "prod_K9as7Q7v8AdiUJ",
    "offer_code": null,
    "original_app_user_id": "uQw121nienNLn6WAMns2abjPMAl2",
    "original_transaction_id": "si_KIGFeHwEFeth5c",
    "period_type": "NORMAL",
    "presented_offering_id": null,
    "price": 0,
    "price_in_purchased_currency": 0,
    "product_id": "prod_KAFcPrBfELJ4cX",
    "purchased_at_ms": 1632594962000,
    "store": "STRIPE",
    "subscriber_attributes": {
      "$displayName": {
        "updated_at_ms": 1632594865463,
        "value": "Florian Thiel"
      },
      "$email": {
        "updated_at_ms": 1632594865463,
        "value": "thiel.florian@me.com"
      }
    },
    "takehome_percentage": 1,
    "transaction_id": "si_KIGFeHwEFeth5c",
    "type": "PRODUCT_CHANGE"
  }
}

All products are mapped: