Query many to many related data through GraphQL

I want to query my data from Directus through GraphQL. I have to two collections Festival and Artists which are connected through a many to many relation. In the GUI everything works fine but when I try to query the records through GraphQL I'm not able to retrieve any fields from the related collection. My query looks like this:

query FestivalList($size: Int = 2, $skip: Int = 0) {
    model: festival(limit: $size, offset: $skip) {
        data {
            festivalId
            name
            artists {
                name
            }
        }
    }
}

As response I get following error: Cannot query field "name" on type "FestivalArtistItem".

So how should I query the related data through GraphQL? I'm using Directus 8.8.1