Cannot fetch multiple content types from Group

Based on what I read in #542, I came up with this query for fetching content from a group. My problem is that only content of one of the content types is returned (`NodeOfficePage`). I've checked global permissions, group permissions, publish status, Group module config etc without help.

What am I missing, and how can I debug this? Does it have to do with the `office-group_node-office_page` filter condition?

```gql
query ($id: String!) {
groupById(id: $id) {
... on Group {
reverseGidGroupContent(filter: {
conditions: {
field: "type.target_id",
value: ["office-group_node-office_page"]
}
}) {
entities {
... on GroupContent {
entityIdOfGroupContent {
entity {
... on NodeOfficePage {
nid
title
__typename
fieldShortName
}
... on NodeArticle {
nid
title
__typename
fieldSubtitle
}
}
}
}
}
}
}
}
}
```

I'm running 3.0-rc3 version of the GraphQL module, and latest Group module.