Unable to update Matrix field using updateViewer Mutation

[Nic1911]

Hi!

I'm trying to update a Matrix field via the updateViewer mutation.

The field has blocks with 3 inner fields (String):

In GraphQL I'm using the following Mutation:

mutation UPDATE_CART(
    $leathers: [cart_MatrixBlockContainerInput]
) {
  updateViewer(cart: {blocks: $leathers}) {
    id
    ... on User {
      id
      cart {
        ... on cart_leather_BlockType {
          id
          leatherId
        }
      }
    }
  }
}

Then I pass the following variables:

"leathers": [{
  "leather": {
      "id": "919191910" , 
      "leatherId": 5330, 
      "quantity": 100, 
     "collectionId": 5322
   }
}]

I'm also passing an Authorization token JWT and the Mutation runs without errors, but the matrix field is empty.

Does anyone had the same issue?
Thanks in advance and regards,

Nicolò

[Nic1911]

Using the same mutation I'm able to update others fields (String) instead.

Ex.:

mutation UPDATE_USER(
    $firstname: String,
  ) {
    updateViewer(
      firstname: $firstname,
    ) {
      id
    }
  }

{ firstname: "Nic" }

So the issue is limited to the Matrix field.

Thanks