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:

1{
2  "api_version": "1.0",
3  "event": {
4    "aliases": [
5      "uQw121nienNLn6WAMns2abjPMAl2"
6    ],
7    "app_id": "app6e36463a7d",
8    "app_user_id": "uQw121nienNLn6WAMns2abjPMAl2",
9    "country_code": null,
10    "currency": "EUR",
11    "entitlement_id": null,
12    "entitlement_ids": null,
13    "environment": "SANDBOX",
14    "event_timestamp_ms": 1632605983882,
15    "expiration_at_ms": 1635186961000,
16    "id": "061D6082-0653-41F8-ACF0-5575F696B4FA",
17    "is_family_share": false,
18    "new_product_id": "prod_K9as7Q7v8AdiUJ",
19    "offer_code": null,
20    "original_app_user_id": "uQw121nienNLn6WAMns2abjPMAl2",
21    "original_transaction_id": "si_KIGFeHwEFeth5c",
22    "period_type": "NORMAL",
23    "presented_offering_id": null,
24    "price": 0,
25    "price_in_purchased_currency": 0,
26    "product_id": "prod_KAFcPrBfELJ4cX",
27    "purchased_at_ms": 1632594962000,
28    "store": "STRIPE",
29    "subscriber_attributes": {
30      "$displayName": {
31        "updated_at_ms": 1632594865463,
32        "value": "Florian Thiel"
33      },
34      "$email": {
35        "updated_at_ms": 1632594865463,
36        "value": "thiel.florian@me.com"
37      }
38    },
39    "takehome_percentage": 1,
40    "transaction_id": "si_KIGFeHwEFeth5c",
41    "type": "PRODUCT_CHANGE"
42  }
43}

All products are mapped: