Deprecated directive used in extend type is broken with mergeSchemas

[BrendanBall]

dependencies:
"graphql": "^14.5.8",
"graphql-tools": "^4.0.6"
I'm getting Unknown directive "deprecated" when using the deprecated directive in an extend type and mergeSchemas. Just using makeExecutableSchema works fine.

const { mergeSchemas, makeExecutableSchema } = require('graphql-tools');

const chirpSchema = `
  type Chirp {
    id: ID!
    text: String
    authorId: ID!
    "works"
    foo: String! @deprecated(reason: "test")
  }

  type Query {
    chirpById(id: ID!): Chirp
    chirpsByAuthorId(authorId: ID!): [Chirp]
  }

  extend type Chirp {
    "breaks"
    bar: String @deprecated(reason: "test")
}
`

const authorSchema = `
  type User {
    id: ID!
    email: String
  }

  type Query {
    userById(id: ID!): User
  }
`

makeExecutableSchema({ typeDefs: chirpSchema }); // works
mergeSchemas({ schemas: [chirpSchema] }); // Error: Unknown directive "deprecated".
mergeSchemas({ schemas: [chirpSchema, authorSchema] }); // Error: Unknown directive "deprecated".

[yaacovCR]

Works with graphql-tools-fork v8.2.0.

[TimSusa]

Why just not taking over graphql-tools-fork fixes to graphql-tools? Really hard for me to understand, just to say its deprecated. Seems to me, like a sad story.

[yaacovCR]

Rolled into #1306 .