Filter in $project cursor in copy activity using Atlas MongoDB connector doesn't work

I have MongoDB Atlas as a source and then upload this data into Fabric DWH with some mappings
I've set up a $project cursor method in the "Source" tab of the Data Pipeline Copy Activity

It works fine when I write it like this:  {field1: 1, field2: 1, field3: 1}

But in my case, I need to add more complex logic with filtering for a particular field, like:

field1: 1, 
field2: 1, 
results: {
    $filter: {
      input: '$results',
      as: 'result',
      cond: {
        $in: [
          '$$result.step',
          [
            'Value1',
            'Value2',
            'Value3',
            'Value4'
          ]
        ]
      }
    }
  }
}

But the fact that this query works with aggregate() function in MongoDB

What can be the issue using this projection within copy activity?