No code generated for interface inline fragments

I can use objects as inline fragments, but for interface fragments no code is generated. Shouldn’t this be possible?

{
... on ClosedEvent {
        # object, works
    }  
... on IssueEvent {
        # interface, no code is generated
    }
}

(Using Swift, but saw similar results with the other targets.)

[gergely-ujvari]

I have an example for this:

Schema: zoo.graphql

interface Feedable {
    _id: ID!,
    kind: String!
    feedWith: String!
}


interface Reptile {
    scaleSkin: String!
}

type Crocodile implements Feedable, Reptile {
    _id: ID!,
    kind: String!
    feedWith: String!
    scaleSkin: String!

    victims: Int!
}

type Iguana implements Feedable, Reptile {
    _id: ID!,
    kind: String!
    feedWith: String!
    scaleSkin: String!

    age: Int!
}

root.graphql

type Query {
    getZoo: [Feedable!]!
}

schema {
    query: Query
}

And now I setup a very simple query with some fragments: zooQuery.graphql

query getZoo {
    getZoo {
        ...FeedableFragment
    }
}

FeedableFragment.graphql

fragment ReptileFragment on Reptile {
    scaleSkin
}

fragment CrocodileFragment on Crocodile {
    victims
}

fragment IguanaFragment on Iguana {
    age
}

fragment FeedableFragment on Feedable {
    _id
    kind,
    feedWith

    ... on Reptile {
        ... ReptileFragment
    }

    ... on Crocodile {
        ... CrocodileFragment
    }

    ... on Iguana {
        ... IguanaFragment
    }
}

And now I check the generated interfaces and I have this:

export interface FeedableFragment {
  _id: string;
  kind: string;
  feedWith: string;
  _id: string;
  kind: string;
  feedWith: string;
  _id: string;
  kind: string;
  feedWith: string;
}

Notice the property duplication and the fact that all inline fragment information is missing.

[csillag]

I can confirm that using the TypeScript code generation, the fields coming from inline fragments with type conditions are missing from the interface that is supposed to describe the results of the query.