Reverse Entity Reference not Working

You are right! Thanks for pointing this out. Due to some refactoring, the field was tripped out. I have now fixed this issue and pushed the code changes to the dev branch. Soon a new release will be published containing the fix.

Example:

query reverseReferences {
  entityById(entityType: USER, id: 1) {
    ... on User {
      reverseReference {
        query(entityType: NODE, referenceFields: ["field_user"]) {
          total
          items {
            label
          }
        }
      }
    }
  }
}

Please note, that the field was renamed from reverseReferences to reverseReference