Map Reduce in Mongosh won't transmit scope

Problem Statement/Rationale

The Mongo standard client will work seamlessly, however, the mongosh client will simply not transmit the scope to the server.

Steps to Reproduce

db.orders.mapReduce(

    monthlyMapFunction,

    reduceFunction,

    {

      query: {

        createdAt: {

          $gt: startDate,

          $lte: endDate

        }

      },

      scope: {

        skus

      },

      out: { reduce: 'monthlyOrders' }

    }

  );

Expected Results

the `skus` variable should be available in both the map and the reduce functions (and, when necessary, in the finalize function).

Actual Results

The `skus` variable is 'null' or undefined.

Additional Notes

It works perfectly fine in the good old mongo client