$facet+$match on positional path doesn't seem to pass results to certain subsequent stages

$matching on a positional path only seems to work as expected within a $facet if there are no subsequent stages. $count, $project, $group all behave as though they receive zero input documents, even though results are correctly returned when no subsequent stage is provided.

$sort, however, seems to function correctly.

original description

The below script leads to an empty scoreRank:

db.test.drop();

db.test.insertMany([{

   "_id": 12345,

   "quizzes": [

     { "score": 100 }

   ]

  },

  {

    "_id": 789,

    "quizzes": [

      { "score": 200 }

    ]

  }

]);

const res = db.test.aggregate([

  {

    $facet: {

      scoreRank: [

        { $match: { 'quizzes.0.score': { $gt: 0 } } },

        { $count: 'count' }

      ]

    }

  }

]).toArray();

print(JSON.stringify(res, null, '  '));

I get the below output:

[

  {

    "scoreRank": []

  }

]

If you replace 'quizzes.0.score' with 'quizzes.score', move $match out of $facet, or move the entire scoreRank pipeline out of $facet I get the expected result:

[

  {

    "scoreRank": [

      {

        "count": 2

      }

    ]

  }

]