Time series query plan results with 2dsphere index do not match collection scan

(function() {

"use strict";

load("jstests/core/timeseries/libs/timeseries.js");

const coll = db.collection;

coll.drop();

assert.commandWorked(

    db.createCollection(coll.getName(), {timeseries: {timeField: 'timestamp', metaField: 'meta'}}));

Random.srand(1);

function random(min, max) {

    return Random.rand() * (max - min + 1) + min;

}

function compareResultsWithAndWithoutIndex(){

    assert.commandWorked(coll.createIndex({location: '2dsphere'}));

    const pipeline = [{

        "$match": {

            "location":

                {"$geoWithin": {"$centerSphere": [[-78.64332757901981, 42.04289085325348], 0.001]}}

        }

    }]

    const results1 = coll.aggregate(pipeline).toArray();

    jsTestLog("results1")

    jsTestLog(results1);

    assert.commandWorked(coll.dropIndexes());

    const results2 = coll.aggregate(pipeline).toArray();

    jsTestLog("results2")

    jsTestLog(results2);

    assert.eq(results1, results2);

}

for (let i = 0; i < 1001; ++i) {

    const doc = {

        timestamp: new Date(),

        meta: 1,

        location: [random(-80.0, -73.0), random(40.0, 45.0)]

    };

    assert.commandWorked(coll.insert(doc));

}

compareResultsWithAndWithoutIndex();

})();