What's the best practice to use the POST /models/instances/query endpoint?

Hi community,

I’m learning to use the /models/instances/query endpoint (with Open Industrial Data, public project) and experiencing some confusion about how cursors and pagination work.

{
    "with": {
        "cities": {
            "nodes": {
                "filter": {
                    "and": [
                        {
                            "exists": {
                                "property": [
                                    "Geography",
                                    "City",
                                    "name"
                                ]
                            }
                        }
                    ]
                }
            }
        },
        "continents": {
            "nodes": {
                "filter": {
                    "and": [
                        {
                            "exists": {
                                "property": [
                                    "Geography",
                                    "Continent",
                                    "name"
                                ]
                            }
                        }
                    ]
                }
            }
        }
    },
    "select": {
        "cities": {
            "sources": [
                {
                    "source": {
                        "type": "view",
                        "space": "Geography",
                        "externalId": "City",
                        "version": "1"
                    },
                    "properties": [
                        "continent",
                        "country",
                        "name",
                        "iso2",
                        "iso3",
                        "population"
                    ]
                }
            ]
        },
        "continents": {
            "sources": [
                {
                    "source": {
                        "type": "view",
                        "space": "Geography",
                        "externalId": "Continent",
                        "version": "1"
                    },
                    "properties": [
                        "name"
                    ]
                }
            ]
        }
    }
}

I built the following query (see above) to fetch cities and continents. I sent the request with no cursors, and got this response: "nextCursor" with both "cities" and "continents", "items" with 100 cities and 6 continents

So, for the next request, I put nextCursor values into the "cursors" field. This time, I only get a nextCursor for cities, and the items are 100 cities and 0 continents.
For the third request, I use the new cursor. And I get 100 more cities, but for continents, I again get the same 6 as in the first request.

Actually I just want to get all cities and continents with the cursors without expecting I might get repeated data.

I want to know:

1. Is this the correct usage for pagination with multiple entities?
2. Is there a recommended best practice for getting all data when querying multiple collections like this?

Additionally, I tried to use data_modeling.instances.query in the Python SDK, but it seems there’s no auto-pagination and I need to pass cursors manually in each call.

Thanks!