Missing field in transfer webhook event (sandbox)

I got the following event through webhook:
 

{
    "event_timestamp_ms" : 1674239936328.0,
    "store" : "APP_STORE",
    "transferred_from" : [ 
        "84c2523f-2f06-49af-886c-a151cc630232"
    ],
    "transferred_to" : [ 
        "48f3ab7f-86fd-45a3-9bf6-db8edeea0904"
    ],
    "type" : "TRANSFER",
    "id" : "00DC5B1C-3166-47FB-8F19-AB2B406F8484",
    "app_id" : "app9a300b6a91"
}

Is it expected? There is no product_id, so I don’t know what should I transfer.