GraphQL Schema API Fails with Input Type

[Kalcode]

Describe the bug
GraphQL API doesn't seem to support type (https://graphql.org/learn/schema/#input-types).

To Reproduce
Steps to reproduce the behavior:

1. Go to 'API TAB'
2. Click on '+ New API'
3. Enter information
4. Schema Type select "GraphQL"
5. Select Format "GraphQL SDL"
6. Click "Create API"
7. Copy and Past SDL below.
8. Click on "Save"
9. Click on "Generate Collection"
10. Name and Click "Generate Collection"

Here I receive the error "Couldn’t generate collection".

Expected behavior
A collection is produced to consume the GraphQL API when using type Input.

Additional context

I used the working example it generates and added the input type parameter instead of name: String!

schema {
  query: Query
  mutation: Mutation
}
input UserInput {
    name: String!
    email: String!
}
type User {
  id: String!
  name: String
}
type Query {
  user (id: String): User
}
type Mutation {
  addUser (input: UserInput): User!
}