Graphql relationship within blocks not populating

[EmilyYond]

I have a page that contains a list of block types, whcih include nested relationships. In my graphql query, I just want to get the IDs from these relationships back, but they are returning an empty array even though content has been set?

Screenshot from the playground - you can see the slices[0].posts array is empty, but there are 2 set in payload. They are definitely published, and are returned using the rest API. Does anyone know why I am getting this empty array?

The featured block is returning its relationship, so the only difference between these two blocsk is that the slider is more nested and allows many in the relationship.

My page setup:

 {
    name: 'slices',
    type: 'blocks',
    blocks: [
      {
        slug: 'slider',
        labels: {
          singular: 'Slider of content',
          plural: 'Sliders of content',
        },
        fields: [
          ...
          {
            name: 'posts',
            label: 'Posts',
            type: 'relationship',
            relationTo: [
              'blog',
              'guide',
              'city',
              'place',
              'perspective',
              'hotel',
              'experience',
            ],
            hasMany: true,
            filterOptions: ({ relationTo, data }) => {
              return {
                _status: {
                  equals: 'published',
                },
              }
            },
          },
        ],
      },
      {
        slug: 'featured',
        labels: {
          singular: 'Featured',
          plural: 'Featured',
        },
        fields: [
          ...
          {
            name: 'post',
            label: 'Post',
            type: 'relationship',
            relationTo: [
              'blog',
              'guide',
              'city',
              'place',
              'perspective',
              'hotel',
              'experience',
            ],
            hasMany: false,
            filterOptions: ({ relationTo, data }) => {
              return {
                _status: {
                  equals: 'published',
                },
              }
            },
          },
        ],
      },
...

Relevant bits of my graphql query:

query {
  DiscoverPage {
    title
    slices {
      __typename
      ... on Slider {
        posts {
          relationTo
          value {
            __typename
            ... on Hotel {
              id
            }
            ... on Blog {
              id
            }
            ... on Perspective {
              id
            }
            ... on Guide {
              id
            }
            ... on City {
              id
            }
            ... on Place {
              id
            }
            ... on Experience {
              id
            }
          }
        }
      }
      ... on Featured {
        post {
          value {
            ... on Hotel {
              id
            }
            ... on Blog {
              id
            }
            ... on Perspective {
              id
            }
            ... on Guide {
              id
            }
            ... on City {
              id
            }
            ... on Place {
              id
            }
            ... on Experience {
              id
            }
          }
        }
      }
    }
  }
}

Appreciate any help, thanks!