problem with entities with multiple @keys: yoga + federation

[endroca]

Describe the bug

When adding multiple @key directives, the gateway stops making requests to the second subgraph.

interface Media @key(fields: "id") {
    id: ID!
    title: String!
    teste: String @inaccessible
}

type Book implements Media @key(fields: "id") @key(fields: "title"){
    id: ID!
    title: String!
    teste: String
} 

When the second @key directive is added, the gateway no longer knows it should go to subgraph 2, resulting in a GraphQL non-null field error.

Your Example Website or App

https://github.com/endroca/yoga-issue-federation

Steps to Reproduce the Bug or Issue

Run app 1.js 2.js and gateway.mjs

Expected behavior

It was expected that the gateway would go to subgraph 1 and then to subgraph 2, but it only goes to subgraph 1 and returns the error

{
  "errors": [
    {
      "message": "Unexpected error.",
      "locations": [
        {
          "line": 5,
          "column": 5
        }
      ],
      "path": [
        "books",
        0,
        "author"
      ]
    }
  ],
  "data": {
    "books": null
  }
}

Screenshots or Videos

No response

Platform

linux

Additional context

No response