There was a codename collision when transforming content type and content type snippet codename to a GraphQL type name. Your GraphQL type 'PageNews' is generated from content type {"Name":"Page - News","Codename":"page___news","Id":"9a075af6-3a03-4268-bf9a-f7e9994e6198"}, content type snippet {"Name":"Page News","Codename":"page_news","Id":"45edbc35-3367-4c67-9c8e-6e7cbcd38e01"}. To fix the codename collision, use such codenames for your content type and content type snippet that remain unique even after removing the underscore characters.

GraphQL request

    query getPageBySlugRef($slug: String!) {
        page_All(limit: 1, where: {slug: {eq: $slug}}) {
            items {
                
_system_ {
    codename
    id
}
slug
title
showBreadcrumbs {
    items {
        _system_ {
            codename
        }
    }
}
sections(limit:20) {
    items {
        _system_ {
            id
            codename
        }
    }
}

            }

        }
    }