Bug: Using a variable in multiple queries only works for first query

I'm using python graphql 2.2.1 with python 3.7. And here is my query:

query allPhotos($page: Int, $perPage: Int, $sortField: String, $sortOrder: String, $filter: PhotoFilter) {
  items: allPhotos(page: $page, perPage: $perPage, sortField: $sortField, sortOrder: $sortOrder, filter: $filter) {
    id
    photographer_id
    event_id
    source
    thumbnail
    created_at
    updated_at
    __typename
  }
  total: _allPhotosMeta(page: $page, perPage: $perPage, filter: $filter) {
    count
    __typename
  }

}

with the following variable:

{
  "filter": {"userId": "1"}
}

So here is what happens:
filter variable is only populated in allPhotos query and _allPhotosMeta filter variable is None. But if I add a new variable like filter2 equal to filter I get the correct result. This only happens in Python. It's ok in NodeJS.