GraphQL omits data from lineitems

Hello,

when requesting orders from the REST and GraphQL, for some lineitems GraphQL returns null for the attribute variant, but using REST for the same order returns a valid variant_id.

Has anyone an idea what might be the issue here?

POST https://shop.myshopify.com/admin/api/2022-07/graphql.json

{
  orders(first: 1, query: "id:99999") {
    edges {
      node {
        id
        lineItems(first: 20) {
          edges {
            node {
              id
              variant {
                id
              }
              sku
            }
          }
        }
      }
    }
  }
}

GET https://shop.myshopify.com/admin/api/2022-07/orders/99999.json